SLOANE, Thomas 0'Conor, chemist, born in New York city, 24 November, 1851. He is a nephew of Charles O'Conor. After graduation at St. Francis Xavier's college in 1870, and at the School of mines of Columbia in 1872, with the degree of E. M., he received the degree of Ph. D. in 1876 from the latter institution, His scientific work has included a method for the determination of sulphur in illuminating gas, and various other improved processes for the estimation of constituents in gas analysis. Dr. Sloane has invented the thermophote, which is the only apparatus ever devised for registering automatically and mechanically the illuminating power of gas. He has lectured extensively in schools and before public audiences, and since 1883 has been lecturer in chemistry and physics at Seton Hall college. His services' have been frequently called for as an expert in patent suits, and he is regularly retained by law firms in New York city. In 1878-'80 he was one of the department editors of the "Sanitary Engineer," and since 1886 has been one of the staff of the "Scientific American." He has contributed largely to technical journals in this country and abroad, and is a member of scientific societies. From 1882 till 1886 he was treasurer of the American chemical society. Dr. Sloane is the translator of Alglave and Boulard's "Electric Light" (New York, i883), and is the author of "Home Experiments in Science" (Philadelphia, 1888).