William Henry was apprenticed to Thomas Percival and later worked with John Ferriar & John Huit at the Manchesters Infirmary.[citation needed] He began to study medicine at University of Edinburgh in 1795, taking his medical in 1807, but ill-health[a] interrupted his practice as a physician, and he devoted his time mainly to chemical research, especially with regard to gases. One of his best-known papers (published in Philosophical Transactions of the Royal Society, 1803) describes experiments on the quantity of gases absorbed by water at different temperatures and under different pressures.[3] His results are known today as Henry's law. His other papers deal with gas-analysis, fire-damp, illuminating gas, the composition of hydrochloric acid and of ammonia, urinary and other morbid concretions, and the disinfecting powers of heat. His Elements of Experimental Chemistry (1799) enjoyed considerable vogue in its day,[4] going through eleven editions in 30 years.[5] He was one of the founders of the Mechanics' Institute, the original precursor of University of Manchester Institute of Science and Technology.
^Henry's manual on chemistry and Parkes's manual on chemistry are mentioned by Charles Darwin as books that he studied before attending Cambridge. Darwin, Charles (1901). The life and letters of Charles Darwin. Vol. 1. D. Appleton. p. 32.
Elwood, Willis J. & Tuxford, A. Felicité (eds.) (1984) Some Manchester Doctors: a biographical collection to mark the 150th anniversary of the Manchester Medical Society, 1834-1984. Manchester: Manchester University Press
Henry, William Charles (1837) A Biographical Account of the late Dr Henry. Manchester: F. Looney (Dr William Charles Henry, also known as Dr Charles Henry, was a son of William Henry; he donated the first collection of scientific books to the Owens College Library in 1851.)