CHRISTIAN ASSOCIATION with his medical practice . In the previous
See also:year he was appointed
See also:foreign secretary of the Royal Society, of which he had. been elected a
See also:fellow in 1794 . In 181r he became physician to St
See also:George's Hospital, and in 1814 he served on a
See also:committee appointed to consider the dangers involved by the general introduction of
See also:gas into
See also:London . In 1816 he was secretary of a commission charged with ascertaining the length of the seconds pendulum, and in 1818 he became secretary to the
See also:Board of Longitude and
See also:superintendent of the Nautical
See also:Almanac . A few years before his
See also:death he became interested in
See also:life assurance, and in 1827 he was chosen one of the eight foreign associates of the French Academy of Sciences . He died in London on the loth of May 1829 .
See also:Young is perhaps best known for his
See also:work in
See also:optics, as the author of a remarkable series of researches which did much to establish the undulatory theory of
See also:light, and as the discoverer of the interference of light (see INTERFERENCE) . He has also been called the founder of physiological optics . In 1793 he explained the mode in which the
See also:eye accommodates itself to vision at different distances as depending on
See also:change of the curvature of the crystalline
See also:lens; in 18o1 he described the defect known as astigmatism; and in his Lectures he put forward the hypothesis, afterwards
See also:developed by H. von Helmholtz, that
See also:colour perception depends on the presence in the retina of three kinds of nerve
See also:fibres which
See also:respond respectively to red,
See also:green and
See also:violet light . In physiology he made an important contribution to haemadynamics in the Croonian lecture for r8o8 on the " Functions of the Heart and
See also:Arteries," and his medical writings included An Introduction to Medical Literature, including a
See also:System of
See also:Practical Nosology (1813) and A Practical and
See also:Treatise on Consumptive Diseases (1815) . In another
See also:field of
See also:research, he was one of the first successful workers at the decipherment of
See also:Egyptian hieroglyphic. inscriptions; by 1814 he had completely translated the enchorial (demotic) text of the Rosetta
See also:stone, and a few years Iater had made considerable progress towards an understanding of the hieroglyphic
See also:alphabet (see
See also:EGYPT, § Language and Writing) . In 1823 he published an Account of the
See also:Recent Discoveries in Hieroglyphic Literature and Egyptian Antiquities .
Some of his conclusions appeared in the famousarticle of Egypt which in 1818 he wrote for the
See also:Encyclopaedia Britannica . His
See also:works were collected, with a Life by G .
See also:Peacock, in 1855 .
CHRISTIAN CATHOLIC CHURCH
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