James Hutton

James Hutton (; 3 June O.S.172614 June 1726 New Style. – 26 March 1797) was a Scottish geologist, agriculturalist, chemical manufacturer, naturalist and physician. Often referred to as the father of modern geology, he played a key role in establishing geology as a modern science.

Hutton advanced the idea that the physical world's remote history can be inferred from evidence in present-day rocks. Through his study of features in the landscape and coastlines of his native Scottish lowlands, such as Salisbury Crags or Siccar Point, he developed the theory that geological features could not be static but underwent continuing transformation over indefinitely long periods of time. From this he argued, in agreement with many other early geologists, that the Earth could not be young. He was one of the earliest proponents of what in the 1830s became known as uniformitarianism, the science which explains features of the Earth's crust as the outcome of continuing natural processes over the long geologic time scale. Hutton also put forward a thesis for a ‘system of the habitable Earth’ proposed as a deistic mechanism designed to keep the world eternally suitable for humans, an early attempt to formulate what today might be called one kind of anthropic principle.

Some reflections similar to those of Hutton can be found in publications of his contemporaries, such as the French naturalist Georges-Louis Leclerc de Buffon, but it is chiefly Hutton's pioneering work that established the field.

Early life and career

Hutton was born in Edinburgh on 3 June O.S. 1726, as one of five children of Sarah Balfour and William Hutton, a merchant who was Edinburgh City Treasurer. Hutton's father died in 1729, when he was three.

He was educated at the High School of Edinburgh where he was particularly interested in mathematics and chemistry, then when he was 14 he attended the University of Edinburgh as a "student of humanity", studying the classics. He was apprenticed to the lawyer George Chalmers WS when he was 17, but took more interest in chemical experiments than legal work. At the age of 18, he became a physician's assistant, and attended lectures in medicine at the University of Edinburgh. After three years he went to the University of Paris to continue his studies, taking the degree of Doctor of Medicine at Leiden University in 1749 with a thesis on blood circulation.

After his degree Hutton went to London, then in mid-1750 returned to Edinburgh and resumed chemical experiments with close friend, James Davie. Their work on production of sal ammoniac from soot led to their partnership in a profitable chemical works, manufacturing the crystalline salt which was used for dyeing, metalworking and as smelling salts and had been available only from natural sources and had to be imported from Egypt. Hutton owned and rented out properties in Edinburgh, employing a factor to manage this business.

Farming and geology

Hutton inherited from his father the Berwickshire farms of ''Slighhouses'', a lowland farm which had been in the family since 1713, and the hill farm of ''Nether Monynut''. In the early 1750s he moved to ''Slighhouses'' and set about making improvements, introducing farming practices from other parts of Britain and experimenting with plant and animal husbandry. He recorded his ideas and innovations in an unpublished treatise on ''The Elements of Agriculture''.

This developed his interest in meteorology and geology. In a 1753 letter he wrote that he had "become very fond of studying the surface of the earth, and was looking with anxious curiosity into every pit or ditch or bed of a river that fell in his way". Clearing and draining his farm provided ample opportunities. The mathematician John Playfair described Hutton as having noticed that "a vast proportion of the present rocks are composed of materials afforded by the destruction of bodies, animal, vegetable and mineral, of more ancient formation". His theoretical ideas began to come together in 1760. While his farming activities continued, in 1764 he went on a geological tour of the north of Scotland with George Maxwell-Clerk,
Playfair
/ref> ancestor of the famous James Clerk Maxwell.

Edinburgh and canal building

In 1768, Hutton returned to Edinburgh, letting his farms to tenants but continuing to take an interest in farm improvements and research which included experiments carried out at ''Slighhouses''. He developed a red dye made from the roots of the madder plant.

He had a house built in 1770 at St John's Hill, Edinburgh, overlooking Salisbury Crags. This later became the Balfour family home and, in 1840, the birthplace of the psychiatrist James Crichton-Browne. Hutton was one of the most influential participants in the Scottish Enlightenment, and fell in with numerous first-class minds in the sciences including mathematician John Playfair, philosopher David Hume and economist Adam Smith. Hutton held no position in the University of Edinburgh and communicated his scientific findings through the Royal Society of Edinburgh. He was particularly friendly with physician and chemist Joseph Black, and together with Adam Smith they founded the ''Oyster Club'' for weekly meetings.

Between 1767 and 1774 Hutton had close involvement with the construction of the Forth and Clyde canal, making full use of his geological knowledge, both as a shareholder and as a member of the committee of management, and attended meetings including extended site inspections of all the works. At this time he is listed as living on Bernard Street in Leith. In 1777 he published a pamphlet on ''Considerations on the Nature, Quality and Distinctions of Coal and Culm'' which successfully helped to obtain relief from excise duty on carrying small coal.

In 1783, he was a joint founder of the Royal Society of Edinburgh.

Later life and death

From 1791 Hutton suffered extreme pain from stones in the bladder and gave up field work to concentrate on finishing his books. A dangerous and painful operation failed to resolve his illness. He died in Edinburgh and was buried in the vault of Andrew Balfour, opposite the vault of his friend Joseph Black, in the now sealed south-west section of Greyfriars Kirkyard commonly known as the Covenanter's Prison.

Hutton did not marry and had no legitimate children. Around 1747 he had a son by a Miss Edington, and though he gave his child James Smeaton Hutton financial assistance, he had little to do with the boy, who went on to become a post-office clerk in London.

Theory of rock formations

Hutton developed several hypotheses to explain the rock formations he saw around him, but according to Playfair he "was in no haste to publish his theory; for he was one of those who are much more delighted with the contemplation of truth, than with the praise of having discovered it". After some 25 years of work, his ''Theory of the Earth; or an Investigation of the Laws observable in the Composition, Dissolution, and Restoration of Land upon the Globe'' was read to meetings of the Royal Society of Edinburgh in two parts, the first by his friend Joseph Black on 7 March 1785, and the second by himself on 4 April 1785. Hutton subsequently read an abstract of his dissertation ''Concerning the System of the Earth, its Duration and Stability'' to Society meeting on 4 July 1785, which he had printed and circulated privately. In it, he outlined his theory as follows;

Search for evidence

In the summer of 1785 at Glen Tilt and other sites in the Cairngorm mountains in the Scottish Highlands, Hutton found granite penetrating metamorphic schists, in a way which indicated that the granite had been molten at the time. This was Hutton's first geological field trip and he was invited by the Duke of Atholl to his hunting lodge, Forest Lodge. The exposures at the Dail-an-eas Bridge demonstrated to him that granite formed from the cooling of molten rock rather than it precipitating out of water as others at the time believed, and therefore the granite must be younger than the schists. Hutton presented his theory of the earth on March 4 and April 7, 1785, at the Royal Society of Edinburgh.

He went on to find a similar penetration of volcanic rock through sedimentary rock in Edinburgh, at Salisbury Crags, adjoining Arthur's Seat – this area of the Crags is now known as Hutton's Section. He found other examples in Galloway in 1786, and on the Isle of Arran in 1787.

The existence of angular unconformities had been noted by Nicolas Steno

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