A series of five Autograph Letters Signed, to Jabez Hogg, the opthalmic surgeon, discussing reports of the River Pollution Commission, proposals for improving various waterworks, the Microscopical examination of water, Hogg’s Report, related technical matters, etc. 5 letters (1 incorporating a diagram), 12 pp. 10 x 8 inches, generally in good condition. 19 Buckingham Street, Adelphi, London, 1874-1876. Samuel Collett Homersham (ca.1816–1886), English hydraulic engineer and hydrologist. He studied rainfall patterns and subterranean water in various parts of England. He also studied impurities in water and effects of softening water supplies. He experimented with various designs of valves for use with water pumps.