Isaac Newton's Later Life
During his residence in London, Isaac Newton had made the acquaintance of John Locke. Locke had taken a very great interest in the new theories of the '' Principia''. He was one of a number of Newton's friends who began to be uneasy and dissatisfied at seeing the most eminent scientific man of his age left to depend upon the meagre remuneration of a college fellowship and a professorship. 1693 During the period 1692–1693 Newton is known to have suffered a breakdown of nervous functioning, or a supposed depressionDavid Fisher see alsoFRANK E. MANUEL 1968/ref> lasting for 18 months, as reported by Huygens. He suffered insomnia and poor digestion, in his letters to friends showing signs of irrationality. During exhumation the hair from Newton's dead body was found to contain high levels of mercury, remains of desiccated hair were later found to contain four times the lead, arsenic and antimony and fifteen times mercury than in normal range samples. Two hairs contained m ...
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