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The apothecaries' system, or apothecaries' weights and measures, is a historical system of
mass Mass is an Intrinsic and extrinsic properties, intrinsic property of a physical body, body. It was traditionally believed to be related to the physical quantity, quantity of matter in a body, until the discovery of the atom and particle physi ...
and
volume Volume is a measure of regions in three-dimensional space. It is often quantified numerically using SI derived units (such as the cubic metre and litre) or by various imperial or US customary units (such as the gallon, quart, cubic inch) ...
units that were used by
physician A physician, medical practitioner (British English), medical doctor, or simply doctor is a health professional who practices medicine, which is concerned with promoting, maintaining or restoring health through the Medical education, study, Med ...
s and apothecaries for
medical prescription A prescription, often abbreviated or Rx, is a formal communication from physicians or other registered healthcare professionals to a pharmacist, authorizing them to dispense a specific prescription drug for a specific patient. Historicall ...
s and also sometimes by scientists."Medicinal-Gewicht, Apotheker-Gewicht ist dasjenige Gewicht, nach welchem Aerzte und Apotheker die Quantitäten der Arzneimittel bestimmen. Nur an wenigen Orten werden beide Arten der Gewichte unterschieden und Medicinalgewicht bei dem Einkauf der Arzneiwaaren im Großen von dem Apothekergewicht bei der Anfertigung und dem Einzel-Verkauf in den Apotheken getrennt. In diesem Fall ist das Medicinalgewicht dem gewöhnlichen Landesgewicht beinahe oder völlig gleich und das Pfund wird dann in 16 Unzen getheilt. Bei dem eigentlichen Apothekergewicht aber nimmt man nur einen Theil des Landesgewichts und theilt dieses Pfund in 12 Unzen oder 96 Drachmen oder 288 Scrupel oder 5760 Gran oder 7452 Aß." The English version of the system is closely related to the English
troy Troy (/; ; ) or Ilion (; ) was an ancient city located in present-day Hisarlik, Turkey. It is best known as the setting for the Greek mythology, Greek myth of the Trojan War. The archaeological site is open to the public as a tourist destina ...
system of weights, the pound and
grain A grain is a small, hard, dry fruit (caryopsis) – with or without an attached husk, hull layer – harvested for human or animal consumption. A grain crop is a grain-producing plant. The two main types of commercial grain crops are cereals and ...
being exactly the same in both. It divides a pound into 12 ounces, an ounce into 8 drachms, and a drachm into 3 scruples of 20 grains each. This exact form of the system was used in the United Kingdom; in some of its former colonies, it survived well into the 20th century. The apothecaries' system of measures is a similar system of volume units based on the fluid ounce. For a long time, medical recipes were written in
Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
, often using special symbols to denote weights and measures. The use of different measure and weight systems depending on the purpose was an almost universal phenomenon in Europe between the decline of the
Roman Empire The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Roman people, Romans conquered most of this during the Roman Republic, Republic, and it was ruled by emperors following Octavian's assumption of ...
and
metrication Metrication or metrification is the act or process of converting to the metric system of measurement. All over the world, countries have transitioned from local and traditional Unit of measurement, units of measurement to the metric system. This ...
. This was connected with international commerce, especially with the need to use the standards of the target market and to compensate for a common weighing practice that caused a difference between actual and nominal weight. In the 19th century, most European countries or cities still had at least a "commercial" or "civil" system (such as the English avoirdupois system) for general trading, and a second system (such as the
troy Troy (/; ; ) or Ilion (; ) was an ancient city located in present-day Hisarlik, Turkey. It is best known as the setting for the Greek mythology, Greek myth of the Trojan War. The archaeological site is open to the public as a tourist destina ...
system) for precious metals such as gold and silver. The system for precious metals was usually divided in a different way from the commercial system, often using special units such as the carat. More significantly, it was often based on different weight standards. The apothecaries' system often used the same ounces as the precious metals system, although even then the number of ounces in a pound could be different. The apothecaries' pound was divided into its own special units, which were inherited (via influential treatises of Greek physicians such as
Dioscorides Pedanius Dioscorides (, ; 40–90 AD), "the father of pharmacognosy", was a Greek physician, pharmacologist, botanist, and author of (in the original , , both meaning "On Materia medica, Medical Material") , a 5-volume Greek encyclopedic phar ...
and
Galen Aelius Galenus or Claudius Galenus (; September 129 – AD), often Anglicization, anglicized as Galen () or Galen of Pergamon, was a Ancient Rome, Roman and Greeks, Greek physician, surgeon, and Philosophy, philosopher. Considered to be one o ...
, 1st and 2nd century) from the general-purpose weight system of the Romans. Where the apothecaries' weights and the normal commercial weights were different, it was not always clear which of the two systems was used in trade between merchants and apothecaries, or by which system apothecaries weighed medicine when they actually sold it.In 1850, an attempt was made in Ireland to solve this problem: "In relation to the weights and measures, a great innovation has been made, which, however, the College feels confident will receive the sanction of the public and the profession. ..In the formularies, however, f the Edinburgh Pharmacopœia the Troy pound, with its well-known submultiples, has been retained, whereas it is now rejected by the Irish College, and its place supplied by the avoirdupois pound, the avoirdupois ounce being, like the Troy ounce, subdivided into eight drachms, and each of these, like the Troy drachm, into three scruples. ..At present the two systems are in use with the apothecary, for his purchases are made in avoirdupois, and his sales generally, though not always, in Troy weight." See als
p. xlvi
and
review of the work
In old merchants' handbooks, the former system is sometimes referred to as the pharmaceutical system and distinguished from the apothecaries' system. __TOC__


English-speaking countries


Weight

From pound down to the scruple, the units of the traditional English apothecaries' system were a subset of the units of the Roman weight system, although the
troy pound Troy weight is a system of Physical unit, units of mass that originated in the Kingdom of England in the 15th century and is primarily used in the precious metals industry. The troy weight units are the Grain (unit), grain, the pennyweight (24 ...
and its subdivisions were slightly heavier than the Roman pound and its subdivisions. Similar systems were used all over Europe, but with considerable local variation described below under Variants. The traditional English apothecaries' system of weights is shown in the first table in this section: the pound, ounce and grain were identical to the troy pound, ounce and grain (also used to measure weights of precious metals; distinct from the avoirdupois pounds and ounces that were used for measurements of other goods.) The confusing variety of definitions and conversions for pounds and ounces is covered elsewhere in a table of pound definitions. To unify all weight systems used by apothecaries, the Irish pharmacopœia of 1850 introduced a new variant of the apothecaries' system which subdivided a new apothecaries' pound of 12 avoirdupois ounces instead of the troy pound. To allow effective use of the new system, new weight pieces were produced. Since an avoirdupois ounce corresponds to 28.35 g, the proposed system was very similar to that in use in Portugal and Spain, and in some locations in Italy. But it would have doubled the value of the avoirdupois drachm (an existing unit, but by then only used for weighing silk). Therefore, it conflicted with other non-standard variations that were based on that nearly obsolete unit. The Irish proposal was not widely adopted, but British legislation, in the form of the Medical Act 1858 ( 21 & 22 Vict. c. 90), was more radical: it prescribed the use of the avoirdupois system for the United Kingdom (then including Ireland), with none of the traditional subdivisions. This innovation was first used in the United British pharmacopœia of 1864, which recommended the adoption in pharmacy of the imperial avoirdupois pound of 7000 grains and ounce of 437.5 grains, and discontinuation of the drachm and scruple. In practice, however, the old apothecaries' system based on divisions of the troy pound, or of the troy ounce of 480 grains, was still widely used until it was abolished by the Weights and Measures Act 1976 (c. 77), since when it may only be used to measure precious metals and stones. (The troy pound had already been declared illegal for most other uses by the Weights and Measures Act 1878 ( 41 & 42 Vict. c. 49), but this act allowed the sale of drugs by apothecaries' weight as an exception.) Apothecaries' units of any kind became obsolete in the UK with the mandatory use of metric drug measurements from January 1, 1971. In the United States, the apothecaries' system remained official until it was abolished in 1971 in favour of the metric system.


Volume

English-speaking countries also used a system of units of fluid measure, or in modern terminology
volume Volume is a measure of regions in three-dimensional space. It is often quantified numerically using SI derived units (such as the cubic metre and litre) or by various imperial or US customary units (such as the gallon, quart, cubic inch) ...
units, based on the apothecaries' system. Originally, the terms and symbols used to describe the volume measurements of liquids were the same as or similar to those used to describe weight measurements of solids (for example, the pound by weight and the fluid pint were both referred to with Latin ''libra,'' symbol ). A volume of liquid that was approximately that of an apothecaries' ounce of water was called a fluid ounce, and was divided into fluid drachms and sometimes also fluid scruples. The smallest unit of liquid volume was traditionally a drop (Latin ''gutta''). Although nominally defined as a sixtieth of the fluid drachm, in practice the drop was a not a standardized unit of volume but was measured by means of releasing literal drops of liquid from the lip of a bottle or vial. The 1809 London ''
Pharmacopoeia A pharmacopoeia, pharmacopeia, or pharmacopoea (or the typographically obsolete rendering, ''pharmacopœia''), meaning "drug-making", in its modern technical sense, is a reference work containing directions for the identification of compound med ...
'' introduced modified terminology for apothecaries' measurements of liquid volume. New terms and symbols introduced by the London College of Physicians (''octarius, minim'') were subsequently adopted by the Pharmacopoeias of the United States and Dublin. The pint was given the Latin name ''octarius'' and represented by the symbol O, thus distinguishing its Latin name and symbol from that of the pound. The terms for fluid ounce and fluid drachm were distinguished from weight measures by the prefix ''fluid-'' (Latin ''Fluiduncia, Fluidrachma'', English ''fluidounce'' and ''fluidrachm'') or in abbreviations by the prefixed letter f (f℥, fʒ). (However, even in the 20th century the f of the symbols f℥, fʒ was sometimes omitted by physicians in the United States, with fluid ounces and fluid drams represented instead simply by the symbols ℥, ʒ.) The smallest unit of volume was standardized as precisely a sixtieth of a fluidrachm (1/61,440 of a wine gallon) and given the name minim. (Subsequently, the old term ''drop'' was sometimes viewed as an approximate equivalent of the new ''minim'', based on their nominally equivalent definitions. In fact, the units were qualitatively different because the traditional drop, by the nature of how it was measured, did not actually correspond to a single definite volume.) Along with the new name of ''minim,'' the London ''Pharmacopoeia'' of 1809 prescribed a new method of measuring the smallest unit of volume using a graduated glass tube. Before introduction of the imperial units in the U.K., all apothecaries' fluid measures were based on the unit of the wine gallon, which survived in the US under the name ''liquid gallon'' or ''wet gallon''. The wine gallon was abolished in Britain in 1826, and this system was replaced by a new one based on the newly introduced imperial gallon. Since the imperial gallon is 20% more than the liquid gallon, the same is true for the imperial pint in relation to the liquid pint. Accordingly, in the new imperial system, the number of fluid ounces per pint was adjusted from 16 to 20 so that the fluid ounce was not changed too much by the reform. Even so, the modern U.K. fluid ounce is 4% ''less'' than the US fluid ounce, and the same is true for the smaller units. For some years both systems were used concurrently in the U.K. As a result, the Imperial and U.S. systems differ in the size of the basic unit (the
gallon The gallon is a unit of volume in British imperial units and United States customary units. The imperial gallon (imp gal) is defined as , and is or was used in the United Kingdom and its former colonies, including Ireland, Canada, Australia ...
or the pint, one gallon being equal to eight pints), and in the number of fluid ounces per pint. Apothecaries' systems for volumes were internationally much less common than those for weights. There were also commonly used, but unofficial divisions of the Apothecaries' system, consisting of: *Glass-tumbler 8 fl. oz. *Breakfast-cup about 8 fl. oz. *Tea-cup 5 fl. oz. *Wine-glass 2 fl. oz. *Table-spoon fl. oz. *Dessert-spoon 2 fl. dr. (same as fl. oz.) *Tea-spoon 1 fl. dr. (same as fl. oz.) In the United States, similar measures in use were once: *Tumblerful — ƒ℥ viii (8 fl oz / 1 cup / 240 mL) *Teacupful — ƒ℥ iv (4 fl oz / 1 gill / 120 mL) *Wineglassful — ƒ℥ ij (2 fl oz / 60 mL) *Tablespoonful — ƒ℥ ss ( fl oz / 3 tsp / 1 Tbsp; 15 mL as once codified in the ninth edition of the
United States Pharmacopeia The ''United States Pharmacopeia'' (''USP'') is a pharmacopeia (compendium of drug information) for the United States published annually by the over 200-year old United States Pharmacopeial Convention (usually also called the USP), a nonprofi ...
(U.S.P. IX)) *Dessertspoonful — ƒʒ ij (≡ ƒ℈ viij or ƒʒ / 2 tsp; 10 mL as once codified in the U.S.P. IX) *Teaspoonful — ƒʒ j (≡ ƒ℈ iv or ƒʒ / 1 tsp; 5 mL as once codified in the U.S.P. IX) ''Remington's Pharmaceutical Sciences'' states: "In almost all cases the modern teacups, tablespoons, dessertspoons, and teaspoons, after careful test by the author, were found to average 25 percent greater capacity than the theoretical quantities given above, and thus the use of accurately graduated medicine glasses, which may be had now at a trifling cost, should be insisted upon." Apothecaries' measures eventually fell out of use in the U.K. and were officially abolished in 1971. In the U.S., they are still occasionally used, for example with prescribed medicine being sold in four-ounce (℥ iv) bottles.


Medical prescriptions

Until around 1900,
medical prescription A prescription, often abbreviated or Rx, is a formal communication from physicians or other registered healthcare professionals to a pharmacist, authorizing them to dispense a specific prescription drug for a specific patient. Historicall ...
s and most European
pharmacopoeia A pharmacopoeia, pharmacopeia, or pharmacopoea (or the typographically obsolete rendering, ''pharmacopœia''), meaning "drug-making", in its modern technical sense, is a reference work containing directions for the identification of compound med ...
s were written in Latin. Here is a typical example from the middle of the 19th century. The use of Latin ensured that the prescriptions could be read by an international audience. There was a technical reason why ''3 ʒ'' was written ''ʒiij,'' and '' ʒ'' as ''ʒss'': Writing ''iii'' as ''iij'' would prevent tampering with or misinterpretation of a number after it is written. The letters "ss" are an abbreviation for the Latin "semis" meaning "half", which were sometimes written with a ß. In Apothecaries' Latin, numbers were generally written in Roman numerals, immediately following the symbol. Since only the units of the apothecaries' system were used in this way, this made it clear that the civil weight system was not meant."As this abbreviation eferring to ''Lb.''is used to represent both the avoirdupois, and troy or apothecaries' pound, it is necessary to observe, that the ''former'' is indicated when this sign is ''preceded'' by ''Arabic figures''; and the ''latter'', when it is followed by Roman numerals."


Variants


Diversity of local standards

The basic form of the apothecaries' system is essentially a subset of the Roman weight system. An apothecaries' pound normally consisted of 12 ounces. (In France this was changed to 16 ounces, and in Spain, the customary unit was the , a mark of 8 ounces.) In the south of Europe and in France, the scruple was generally divided into 24 grains, so that one ounce consisted of 576 grains. Nevertheless, the subdivision of an ounce was somewhat more uniform than that of a pound, and a common feature of all variants is that 12 ounces are roughly 100 drachms (96–128 drachms) and a grain is roughly the weight of a physical grain. It is most convenient to compare the various local weight standards by the metric weights of their ounces. The actual mass of an ounce varied by ±17% (5 g) around the typical value of 30 g. The table only shows approximate values for the most important standards; even the same nominal standard could vary slightly between one city and its neighbour. The range from 25 g to 31 g is filled with numerous variants, especially the Italian range up to 28 g. But there is a relatively large gap between the troy ounces of 31 g and the Habsburg ounce of 35 g. The latter is the product of an 18th-century weight reform. Even in Turkey a system of weights similar to the European apothecaries' system was used for the same purpose. For medical purposes the tcheky (approx. 320 g) was divided in 100 drachms, and the drachm in (16 kilos or) 64 grains.Volume 1
an
Volume 2
This is close to the classical Greek weight system, where a ''mina'' (corresponding roughly to a Roman ''libra'') was also divided into 100 drachms. With the beginning of metrication, some countries standardized their apothecaries' pound to an easily remembered multiple of the French
gram The gram (originally gramme; SI unit symbol g) is a Physical unit, unit of mass in the International System of Units (SI) equal to one thousandth of a kilogram. Originally defined in 1795 as "the absolute Mass versus weight, weight of a volume ...
me. E.g. in the Netherlands the Dutch troy pound of 369.1 g was standardized in 1820 to 375.000 g, to match a similar reform in France. The British troy pound retained its value of 373.202 g until in 2000 it was legally defined in metric terms, as 373.2417216 g. (At this time its use was mainly confined to trading precious metals.)


Basic variants

In the Romance speaking part of Europe the scruple was divided in 24 grains, in the rest of Europe in 20 grains. Notable exceptions were Venice and Sicily, where the scruple was also divided in 20 grains. The Sicilian apothecaries ounce was divided into 10 drachms. Since the scruple was divided into only 20 grains, like in the northern countries, an ounce consisted of 600 grains. This was not too different from the situation in most of the other Mediterranean countries, where an ounce consisted of 576 grains. In France, at some stage the apothecaries' pound of 12 ounces was replaced by the larger civil pound of 16 ounces. The subdivisions of the apothecaries ounce were the same as in the other Romance countries, however, and were different from the subdivisions of the otherwise identical civil ounce.


Origins


Roman weight system

The basic apothecaries' system consists of the units pound, ounce, and scruple from the classical Roman weight system, together with the originally Greek drachm and a new subdivision of the scruple into either 20 ("barley") or 24 ("wheat") grains (). In some countries other units of the original system remained in use, for example in Spain the and . In some cases the apothecaries' and civil weight systems had the same ounces ("an ounce is an ounce"), but the civil pound consisted of 16 ounces. is Latin for the seed of the carob tree. Many attempts were made to reconstruct the exact mass of the Roman pound. One method for doing this consists in weighing old coins; another uses the fact that Roman weight units were derived from Roman units of length similar to the way the kilogramme was originally derived from the metre, i.e. by weighing a known volume of water. Nowadays the Roman pound is often given as 327.45 g, but one should keep in mind that (apart from the other uncertainties that come with such a reconstruction) the Roman weight standard is unlikely to have remained constant to such a precision over the centuries, and that the provinces often had somewhat inexact copies of the standard. The weight and subdivision of the pound in the
Holy Roman Empire The Holy Roman Empire, also known as the Holy Roman Empire of the German Nation after 1512, was a polity in Central and Western Europe, usually headed by the Holy Roman Emperor. It developed in the Early Middle Ages, and lasted for a millennium ...
were reformed by
Charlemagne Charlemagne ( ; 2 April 748 – 28 January 814) was List of Frankish kings, King of the Franks from 768, List of kings of the Lombards, King of the Lombards from 774, and Holy Roman Emperor, Emperor of what is now known as the Carolingian ...
, but in the
Byzantine Empire The Byzantine Empire, also known as the Eastern Roman Empire, was the continuation of the Roman Empire centred on Constantinople during late antiquity and the Middle Ages. Having survived History of the Roman Empire, the events that caused the ...
it remained essentially the same. Since Byzantine coins circulated up to
Scandinavia Scandinavia is a subregion#Europe, subregion of northern Europe, with strong historical, cultural, and linguistic ties between its constituent peoples. ''Scandinavia'' most commonly refers to Denmark, Norway, and Sweden. It can sometimes also ...
, the old Roman standard continued to be influential through the Middle Ages.


Weight system of Salerno

The history of mediaeval medicine started roughly around the year 1000 with the school of medicine in Salerno, which combined elements of Latin, Greek, Arabic, and Jewish medicine.
Galen Aelius Galenus or Claudius Galenus (; September 129 – AD), often Anglicization, anglicized as Galen () or Galen of Pergamon, was a Ancient Rome, Roman and Greeks, Greek physician, surgeon, and Philosophy, philosopher. Considered to be one o ...
and
Dioscorides Pedanius Dioscorides (, ; 40–90 AD), "the father of pharmacognosy", was a Greek physician, pharmacologist, botanist, and author of (in the original , , both meaning "On Materia medica, Medical Material") , a 5-volume Greek encyclopedic phar ...
(who had used the Graeco-Roman weight system) were among the most important authorities, but also Arabic physicians, whose works were systematically translated into Latin. According to , a famous 13th-century text that exists in numerous variations and is often ascribed to Dino di Garbo, the system of weights used in Salerno was different from the systems used in Padua and Bologna. As can be seen from the table, it was also different from the Roman weight system used by Galenus and Dioscorides and from all modern apothecaries' systems: The ounce was divided into 9 drachms, rather than 8 drachms. Centuries later, the region around
Salerno Salerno (, ; ; ) is an ancient city and ''comune'' (municipality) in Campania, southwestern Italy, and is the capital of the namesake province, being the second largest city in the region by number of inhabitants, after Naples. It is located ...
was the only exception to the rule that (except for skipping units that had regionally fallen out of use) the apothecaries' ounce was subdivided down to the scruple in exactly the same way as in the Roman system: It divided the ounce into 10 drachms.


Romance countries

While there will naturally have been some changes throughout the centuries, this section only tries to give a general overview of the situation that was recorded in detail in numerous 19th-century merchants' handbooks. ;Iberian Peninsula On the
Iberian Peninsula The Iberian Peninsula ( ), also known as Iberia, is a peninsula in south-western Europe. Mostly separated from the rest of the European landmass by the Pyrenees, it includes the territories of peninsular Spain and Continental Portugal, comprisin ...
, apothecaries' weights in the 19th century were relatively uniform, with 24 grains per scruple (576 grains per ounce), the standard in Romance countries. The weight of an apothecaries' pound was 345.1 g in
Spain Spain, or the Kingdom of Spain, is a country in Southern Europe, Southern and Western Europe with territories in North Africa. Featuring the Punta de Tarifa, southernmost point of continental Europe, it is the largest country in Southern Eur ...
and 344.2 g in
Portugal Portugal, officially the Portuguese Republic, is a country on the Iberian Peninsula in Southwestern Europe. Featuring Cabo da Roca, the westernmost point in continental Europe, Portugal borders Spain to its north and east, with which it share ...
. As in Italy, some of the additional subdivisions of the Roman system, such as the , were still in use there. It was standard to use the , defined as 8 ounces, instead of the pound. ;France In 18th century
France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
, there was a national weight standard, the of 8 ounces. The civil pound of 16 ounces was equivalent to 2 marks, and it was also used as the apothecaries' pound. With 30.6 g, the ounces were considerably heavier than other apothecaries ounces in Romance countries, but otherwise, the French system was not remarkable. Its history and connections to the English and Flemish standards are discussed below under Weight standards named after Troyes. ;Italy Due in part to the political conditions in what would become a united
Kingdom of Italy The Kingdom of Italy (, ) was a unitary state that existed from 17 March 1861, when Victor Emmanuel II of Kingdom of Sardinia, Sardinia was proclamation of the Kingdom of Italy, proclaimed King of Italy, until 10 June 1946, when the monarchy wa ...
only in 1861, the variation of apothecaries' systems and standard weights in this region was enormous. (For background information, see History of Italy during foreign domination and the unification.) The (pound) generally consisted of the standard twelve ounces, however. The civil weight systems were generally very similar to the apothecaries' system, and since the (or the , where different systems were in use for light and heavy goods) generally had a suitable weight for an apothecaries' pound it was often used for this purpose. Extreme cases were
Rome Rome (Italian language, Italian and , ) is the capital city and most populated (municipality) of Italy. It is also the administrative centre of the Lazio Regions of Italy, region and of the Metropolitan City of Rome. A special named with 2, ...
and
Genoa Genoa ( ; ; ) is a city in and the capital of the Italian region of Liguria, and the sixth-largest city in Italy. As of 2025, 563,947 people live within the city's administrative limits. While its metropolitan city has 818,651 inhabitan ...
, where the same system was used for everything, including medicine. On the other hand, there were relatively large differences even between two cities in the same state. E.g.
Bologna Bologna ( , , ; ; ) is the capital and largest city of the Emilia-Romagna region in northern Italy. It is the List of cities in Italy, seventh most populous city in Italy, with about 400,000 inhabitants and 150 different nationalities. Its M ...
(in the
Papal States The Papal States ( ; ; ), officially the State of the Church, were a conglomeration of territories on the Italian peninsula under the direct sovereign rule of the pope from 756 to 1870. They were among the major states of Italy from the 8th c ...
) had an apothecaries pound that was less than the local civil pound, and 4% lighter than the pound used in Rome. The weight of an apothecaries' pound ranged generally between 300 g and 320 g, slightly less than that of a pound in the Roman Empire. An important exception to this rule is that the Kingdom of Lombardy–Venetia was under the rule of the
Habsburg monarchy The Habsburg monarchy, also known as Habsburg Empire, or Habsburg Realm (), was the collection of empires, kingdoms, duchies, counties and other polities (composite monarchy) that were ruled by the House of Habsburg. From the 18th century it is ...
1814–1859 and therefore had the extremely large Habsburg apothecaries' pound of 420 g. (See below under Habsburg standard.) E.g. in the large city of
Milan Milan ( , , ; ) is a city in northern Italy, regional capital of Lombardy, the largest city in Italy by urban area and the List of cities in Italy, second-most-populous city proper in Italy after Rome. The city proper has a population of nea ...
the apothecaries' system based on a pound of 326.8 g was officially replaced by the metric system as early as 1803, because Milan was part of the Napoleonic
Italian Republic Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...
. Since the successor of this little state, the Napoleonic
Kingdom of Italy The Kingdom of Italy (, ) was a unitary state that existed from 17 March 1861, when Victor Emmanuel II of Kingdom of Sardinia, Sardinia was proclamation of the Kingdom of Italy, proclaimed King of Italy, until 10 June 1946, when the monarchy wa ...
, fell to Habsburg in 1814 (at a time when even in
France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...
the had been introduced because the metric system was not accepted by the population), an apothecaries' system was officially introduced again, but now based on the Habsburg apothecaries' pound, which weighed almost 30% more. The apothecaries' pound in
Venice Venice ( ; ; , formerly ) is a city in northeastern Italy and the capital of the Veneto Regions of Italy, region. It is built on a group of 118 islands that are separated by expanses of open water and by canals; portions of the city are li ...
had exactly the same subdivisions as those in the non-Romance countries, but its total weight of 301 g was at the bottom of the range. During the Habsburg reign of 1814–1859 an exception was made for Venice; as a result, the extreme weights of 301 g and 420 g coexisted within one state and in immediate proximity. The Venice standard was also used elsewhere, for example in
Udine Udine ( ; ; ; ; ) is a city and (municipality) in northeastern Italy, in the middle of the Friuli-Venezia Giulia region, between the Adriatic Sea and the Carnic Alps. It is the capital of the Province of Udine, Regional decentralization entity ...
. In
Dubrovnik Dubrovnik, historically known as Ragusa, is a city in southern Dalmatia, Croatia, by the Adriatic Sea. It is one of the most prominent tourist destinations in the Mediterranean Sea, Mediterranean, a Port, seaport and the centre of the Dubrovni ...
(called "Ragusa" until 1909) its use was partially continued for a long time in spite of the official Habsburg weight reform. The measure and weight systems for the large mainland part of the
Kingdom of the Two Sicilies The Kingdom of the Two Sicilies () was a kingdom in Southern Italy from 1816 to 1861 under the control of the House of Bourbon-Two Sicilies, a cadet branch of the House of Bourbon, Bourbons. The kingdom was the largest sovereign state by popula ...
were unified in 1840. The area consisted of the southern half of the Italian Peninsula and included Naples and Salerno. The subdivision of apothecaries' weight in the unified system was essentially the same as that for gold, silver, coins, and silk. It was the most excentric variant in that the ounce was divided in 10 drachms, rather than the usual 8. The scruple, like in Venice but unlike in the rest of the Romance region, was divided into 20 grains. The existence of a unit called , the equivalent of , is interesting because 6 were 9 . In the original Salerno weight system an ounce was divided into 9 drachms, and so an would have been of an ounce.


Troyes, Nuremberg, and Habsburg


Weight standards named after Troyes

As early as 1147 in
Troyes Troyes () is a Communes of France, commune and the capital of the Departments of France, department of Aube in the Grand Est region of north-central France. It is located on the Seine river about south-east of Paris. Troyes is situated within ...
in
Champagne Champagne (; ) is a sparkling wine originated and produced in the Champagne wine region of France under the rules of the appellation, which demand specific vineyard practices, sourcing of grapes exclusively from designated places within it, spe ...
(in the Middle Ages an important trading town) a unit of weight called was used. The national French standard until 1799 was based on a famous artifact called the , which probably dates back to the second half of the 15th century. It is an elaborate set of nesting weight pieces, with a total metric weight of 12.238 ''kg''. The set is now shown in the
Musée des Arts et Métiers The Musée des Arts et Métiers (; English: Museum of Arts and Crafts) is an industrial design museum in Paris that houses the collection of the Conservatoire national des arts et métiers, which was founded in 1794 as a repository for the preser ...
in Paris. The total nominal value of the set is 50 or , a mark being 8 ounces. The ounce had therefore a metric equivalent of 30.59 g. The was used as a national French standard for trading, for gold, silver, and jewels, and for weighing medicine. It was also used in international communications between scientists. In the time before the French Revolution, the civil pound also played the role of the apothecaries' pound in the French apothecaries' system, which otherwise remained a standard system of the Romance (24 grains per scruple) type. In
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,
Amsterdam Amsterdam ( , ; ; ) is the capital of the Netherlands, capital and Municipalities of the Netherlands, largest city of the Kingdom of the Netherlands. It has a population of 933,680 in June 2024 within the city proper, 1,457,018 in the City Re ...
,
Antwerp Antwerp (; ; ) is a City status in Belgium, city and a Municipalities of Belgium, municipality in the Flemish Region of Belgium. It is the capital and largest city of Antwerp Province, and the third-largest city in Belgium by area at , after ...
and other Flemish cities, a "troy" unit ("") was also in use as a standard for valuable materials and medicine. As in France, the way in which the Flemish troy ounce was subdivided depended on what was weighed. Unlike the French, the Flemish apothecaries divided the scruple into 20 grains. The Flemish troy pound became the standard for the gold and apothecaries' system in the United Kingdom of the Netherlands; it was also used in this way in
Lübeck Lübeck (; or ; Latin: ), officially the Hanseatic League, Hanseatic City of Lübeck (), is a city in Northern Germany. With around 220,000 inhabitants, it is the second-largest city on the German Baltic Sea, Baltic coast and the second-larg ...
. (The London troy pound was referred to as the '', after metrification.) The Dutch troy mark consisted of 8 Flemish troy ounces, with each ounce of 20 engels, and each engel divided into 32 assen. The Amsterdam Pound of two marks, used in commerce, weighed 10,280 assen, while the Amsterdam Troy pound weighed 10,240 assen, i.e. exactly two troy marks. In 1414, six years before the Treaty of Troyes, a statute of
Henry V of England Henry V (16 September 1386 – 31 August 1422), also called Henry of Monmouth, was King of England from 1413 until his death in 1422. Despite his relatively short reign, Henry's outstanding military successes in the Hundred Years' War against ...
gave directions to the goldsmiths in terms of the
troy pound Troy weight is a system of Physical unit, units of mass that originated in the Kingdom of England in the 15th century and is primarily used in the precious metals industry. The troy weight units are the Grain (unit), grain, the pennyweight (24 ...
. (In 1304 it had apparently not yet been introduced, since it did not appear in the statute of weights and measures.) There is evidence from the 15th century that the troy pound was used for weighing metals and spices. After the abolishment of the Tower pound in 1527 by
Henry VIII of England Henry VIII (28 June 149128 January 1547) was King of England from 22 April 1509 until his death in 1547. Henry is known for his Wives of Henry VIII, six marriages and his efforts to have his first marriage (to Catherine of Aragon) annulled. ...
, the troy pound was the official basis for English coin weights. The British apothecaries' system was based on the troy pound until metrication, and it survived in the United States and Australia well into the 20th century. Since the modern (English, American and Imperial) troy ounces are roughly 1.5% heavier than the late Paris ounce, the exact historical relations between the original , the French , the Flemish and the English troy pound are unclear. It is known, however, that the numerical relation between the English and French troy ounces was ''exactly'' 64:63 in the 14th century.


Nuremberg standard

In the Middle Ages the Imperial Free City of
Nuremberg Nuremberg (, ; ; in the local East Franconian dialect: ''Nämberch'' ) is the Franconia#Towns and cities, largest city in Franconia, the List of cities in Bavaria by population, second-largest city in the States of Germany, German state of Bav ...
, an important trading place in the south of Germany, produced large amounts of nesting weight pieces to various European standards. In the 1540s, the first
pharmacopoeia A pharmacopoeia, pharmacopeia, or pharmacopoea (or the typographically obsolete rendering, ''pharmacopœia''), meaning "drug-making", in its modern technical sense, is a reference work containing directions for the identification of compound med ...
in the modern sense was also printed there. In 1555, a weight standard for the apothecaries' pound of 12 ounces was set in Nuremberg. Under the name ''Nuremberg pharmaceutical weight'' () it would become the standard for most of the north-east of Europe. However, some cities kept local copies of the standard. As of 1800 all German states and cities except
Lübeck Lübeck (; or ; Latin: ), officially the Hanseatic League, Hanseatic City of Lübeck (), is a city in Northern Germany. With around 220,000 inhabitants, it is the second-largest city on the German Baltic Sea, Baltic coast and the second-larg ...
(which had the Dutch troy standard) followed the Nuremberg standard. It was also the standard for Denmark, Norway, the Russian Empire, and most cantons of Switzerland. Poland and Sweden had their own variants of the standard, which differed from each other by 0.6%. In 1811,
Bavaria Bavaria, officially the Free State of Bavaria, is a States of Germany, state in the southeast of Germany. With an area of , it is the list of German states by area, largest German state by land area, comprising approximately 1/5 of the total l ...
legally defined the apothecaries' pound as 360.00 g (an ounce of 30.00 g). In 1815,
Nuremberg Nuremberg (, ; ; in the local East Franconian dialect: ''Nämberch'' ) is the Franconia#Towns and cities, largest city in Franconia, the List of cities in Bavaria by population, second-largest city in the States of Germany, German state of Bav ...
lost its status as a free city and became part of Bavaria. From now on the Nuremberg apothecaries' pound was no longer the official apothecaries' pound in Nuremberg; but the difference was only 0.6%. In 1836 the Greek apothecaries' pound was officially defined by this standard, four years after Otto, the son of the king of Bavaria, became the first king of Greece. But only few German states followed the example of Bavaria, and with a long delay. The apothecaries' pound of 360 g was also adopted in Lübeck, where it was official as of 1861. Austria and the states of the
Habsburg monarchy The Habsburg monarchy, also known as Habsburg Empire, or Habsburg Realm (), was the collection of empires, kingdoms, duchies, counties and other polities (composite monarchy) that were ruled by the House of Habsburg. From the 18th century it is ...
officially had a different standard since 1761, and
Prussia Prussia (; ; Old Prussian: ''Prūsija'') was a Germans, German state centred on the North European Plain that originated from the 1525 secularization of the Prussia (region), Prussian part of the State of the Teutonic Order. For centuries, ...
, followed by its neighbours
Anhalt Saxony-Anhalt ( ; ) is a state of Germany, bordering the states of Brandenburg, Saxony, Thuringia and Lower Saxony. It covers an area of and has a population of 2.17 million inhabitants, making it the 8th-largest state in Germany by area an ...
,
Lippe Lippe () is a ''Kreis'' (district) in the east of North Rhine-Westphalia, Germany. Neighboring districts are Herford, Minden-Lübbecke, Höxter, Paderborn, Gütersloh, and district-free Bielefeld, which forms the region Ostwestfalen-Lippe. ...
and
Mecklenburg Mecklenburg (; ) is a historical region in northern Germany comprising the western and larger part of the federal-state Mecklenburg-Western Pomerania. The largest cities of the region are Rostock, Schwerin, Neubrandenburg, Wismar and Güstrow. ...
, would diverge in the opposite direction with a reform in 1816. But in both cases apothecaries continued to use the Nuremberg standard unofficially for a long time after it became illegal. In Russia the apothecaries' system survived well into the 20th century. The Soviet Union officially abolished it only in January 1927.


Habsburg standard

Empress Maria Theresia of Austria reformed the measures and weights of the
Habsburg monarchy The Habsburg monarchy, also known as Habsburg Empire, or Habsburg Realm (), was the collection of empires, kingdoms, duchies, counties and other polities (composite monarchy) that were ruled by the House of Habsburg. From the 18th century it is ...
in 1761. The weight of an apothecaries' pound of 12 ounces was increased to a value that was later (after the kilogramme was defined) found to be 420.009 g; this was called the . It was defined as of the unusually heavy Habsburg civil pound (defined as of the civil pound of
Cologne Cologne ( ; ; ) is the largest city of the States of Germany, German state of North Rhine-Westphalia and the List of cities in Germany by population, fourth-most populous city of Germany with nearly 1.1 million inhabitants in the city pr ...
) and corresponded to a record ounce weight of 35 g. Before the reform, in the north of the empire, the Nuremberg standard had been in effect, and in Italy, the local standards had been even lighter. It is not surprising that an increase of 17% and more met with some inertia. The 1770 edition of the
pharmacopoeia A pharmacopoeia, pharmacopeia, or pharmacopoea (or the typographically obsolete rendering, ''pharmacopœia''), meaning "drug-making", in its modern technical sense, is a reference work containing directions for the identification of compound med ...
still used the Nuremberg standard , indicating that even in the Austrian capital
Vienna Vienna ( ; ; ) is the capital city, capital, List of largest cities in Austria, most populous city, and one of Federal states of Austria, nine federal states of Austria. It is Austria's primate city, with just over two million inhabitants. ...
it took some time for the reform to become effective. In 1774, the used the new standard, and in 1783 all old apothecaries' weight pieces that were still in use were directed to be destroyed. Venice was not part of these reforms and kept its standard of approximately 25 g per ounce. When Austria started producing scales and weight pieces to the new standard with an excellent quality/price ratio, these were occasionally used by German apothecaries as well.


Metrication


Early metrication

At the time of the
Industrial Revolution The Industrial Revolution, sometimes divided into the First Industrial Revolution and Second Industrial Revolution, was a transitional period of the global economy toward more widespread, efficient and stable manufacturing processes, succee ...
, the fact that each state had its own system of weights and measures became increasingly problematic. Serious work on a "scientific" system was started in France under
Louis XVI Louis XVI (Louis-Auguste; ; 23 August 1754 – 21 January 1793) was the last king of France before the fall of the monarchy during the French Revolution. The son of Louis, Dauphin of France (1729–1765), Louis, Dauphin of France (son and heir- ...
, and completed in 1799 (after the French Revolution) with its implementation. The French population, however, was initially unhappy with the new system. In 1812,
Napoleon Bonaparte Napoleon Bonaparte (born Napoleone di Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French general and statesman who rose to prominence during the French Revolution and led Military career ...
reintroduced some of the old measurements, but in a modified form that was defined with respect to the metric system. This was finally abolished in 1837 and became illegal in 1840. Due to the large expansion of the
First French Empire The First French Empire or French Empire (; ), also known as Napoleonic France, was the empire ruled by Napoleon Bonaparte, who established French hegemony over much of continental Europe at the beginning of the 19th century. It lasted from ...
under
Napoleon I Napoleon Bonaparte (born Napoleone di Buonaparte; 15 August 1769 – 5 May 1821), later known by his regnal name Napoleon I, was a French general and statesman who rose to prominence during the French Revolution and led Military career ...
, French metrication also affected what would be (parts of) France's neighbour countries after the
Congress of Vienna The Congress of Vienna of 1814–1815 was a series of international diplomatic meetings to discuss and agree upon a possible new layout of the European political and constitutional order after the downfall of the French Emperor Napoleon, Napol ...
. The Netherlands were partially metricated when they were French, in the years 1810–1813. With full metrication, effective January 1821, the Netherlands reformed the . The apothecaries' new pound was 375.00 g. Apart from rounding issues concerning the subdivisions, this corresponded exactly to the French . (The reform was not followed in the north German city of Lübeck, which continued to use the .) In Belgium, apothecaries' weight was metricated effective 1856. From 1803 to 1815, all German regions west of the River Rhine were French, organised in the
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, Sarre, Rhin-et-Moselle, and
Mont-Tonnerre Mont-Tonnerre () was a department of the First French Republic and later the First French Empire in present-day Germany. It was named after the highest point in the Palatinate, the '' Donnersberg'' ("Thunder Mountain", possibly referring to Do ...
. As a result of the Congress of Vienna these became part of various German states. A large part of the Palatinate fell to
Bavaria Bavaria, officially the Free State of Bavaria, is a States of Germany, state in the southeast of Germany. With an area of , it is the list of German states by area, largest German state by land area, comprising approximately 1/5 of the total l ...
, but having the metric system it was excepted from the Bavarian reform of weights and measures.


Prussia's path to metrication

In
Prussia Prussia (; ; Old Prussian: ''Prūsija'') was a Germans, German state centred on the North European Plain that originated from the 1525 secularization of the Prussia (region), Prussian part of the State of the Teutonic Order. For centuries, ...
, a reform in 1816 defined the Prussian civil pound in terms of the Prussian foot and distilled water. It also redefined the apothecaries' pound as 12 ounces, i.e. of the civil pound: 350.78 g. This reform was not popular with apothecaries, because it broke the uniformity of the apothecaries' pound in Germany at a time when a German national state was beginning to form. It seems that many apothecaries did not follow this reduction by 2%. Another reform in 1856 increased the civil pound from 467.711 g to 500.000 g (the German civil pound defined by the
Zollverein The (), or German Customs Union, was a coalition of States of the German Confederation, German states formed to manage tariffs and economic policies within their territories. Organized by the 1833 treaties, it formally started on 1 January 1 ...
), as a first step towards
metrication Metrication or metrification is the act or process of converting to the metric system of measurement. All over the world, countries have transitioned from local and traditional Unit of measurement, units of measurement to the metric system. This ...
. As a consequence the official apothecaries' pound was now 375.000 g, i.e. it was increased by 7%, and it was now very close to the troy standards. §4 of the law that introduced this reform said: "Further, a pharmaceutical weight deviating from the civil weight does not take place." But this paragraph was suspended until further notice. The abolishment of the apothecaries' system meant that doctors' prescriptions had to take place in terms of the current civil weight: grammes and kilograms. This was considered unfeasible by many, and the state received numerous protests and asked for expertises. Nevertheless, by 1868 §4 of the earlier reform was finally put into force.


Metrication in countries using the troy and avoirdupois systems

Britain was initially involved in the development of the metric system, and the US was among the 17 initial signatories of the
Metre Convention The Metre Convention (), also known as the Treaty of the Metre, is an international treaty that was signed in Paris on 20 May 1875 by representatives of 17 nations: Argentina, Austria-Hungary, Belgium, Brazil, Denmark, France, German Empire, Ge ...
in 1875. Yet in spite of enthusiastic support for the new system by intellectuals such as
Charles Dickens Charles John Huffam Dickens (; 7 February 1812 – 9 June 1870) was an English novelist, journalist, short story writer and Social criticism, social critic. He created some of literature's best-known fictional characters, and is regarded by ...
, these two countries were particularly slow to implement it. In the US, the metric system replaced the apothecaries' system in the
United States Pharmacopeia The ''United States Pharmacopeia'' (''USP'') is a pharmacopeia (compendium of drug information) for the United States published annually by the over 200-year old United States Pharmacopeial Convention (usually also called the USP), a nonprofi ...
of 1971. In the UK, metric drug measurements were required for dealings in drugs from January 1, 1971.


See also

*
List of abbreviations used in medical prescriptions This is a list of abbreviations used in medical prescriptions, including hospital orders (the patient-directed part of which is referred to as sig codes). This list does not include abbreviations for pharmaceuticals or drug name suffixes such as C ...
*
List of Latin abbreviations This is a list of common Latin abbreviations. Nearly all the abbreviations below have been adopted by Modern English. However, with some exceptions (for example, ''versus'' or '' modus operandi''), most of the Latin referent words and phrases a ...


References


Citations


Sources

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Further reading

* * * *


External links


Apothecaries' symbols



Pharmacopoeia pro Republica Augustana, 1613

Pharmacopoeia Collegii Regalis Londini, 1677

Pharmacopoea Collegii Londinensis Medicor, 1746
{{DEFAULTSORT:Apothecaries' System Obsolete units of measurement Units of mass History of pharmacy