BENJAMIN SILLIMAN. 525 



Professor Silliman's connection with the Yale Scientific .School was 

 interrupted by his removal to Louisville in 1849, where for five years 

 he discharged the duties of Professor of Medical Chemistry and Toxi- 

 cology in the Medical College of that place. When he returned to 

 New Haven, in 1854, to enter upon instruction in the Academic and 

 Medical Departments of Yale College, recently resigned by his father, 

 the direction of the Scientific School had passed into other hands, 

 but he retained a nominal connection with it until 18G9. In 1870 

 he resigned his connection with the Academic Department of the 

 College, but he retained his connection with the Medical Department 

 until his death. 



In 1838, when twenty-two years old, Mr. Silliman became asso- 

 ciated with his father in the editorship of " The American Journal 

 of Science and Arts," the Journal being then in its twenty-first year. 

 This arrangement continued until the close of 1845, when the first 

 series of fifty volumes was ended ; after which his brother-in-law, 

 Professor James D. Dana, was associated with Mr. Silliman in the 

 editorial duties. Up to the present time, 1885, his name has stood 

 among those of the editors of the Journal now for nearly half a 

 century. Besides devoting a large amount of time to the work of 

 editing, Mr. Silliman published in the Journal more than fifty papers, 

 embracing a large range of subjects. Most of these were descriptions 

 of minerals, chiefly from the chemical side, which present points of 

 great interest. We may mention the paper on Calcareous Corals 

 (1846) ; on Emerald Nickel, from Texas, Pa. (1847) ; on the Results 

 of the Optical Examination of the Micas (1850) ; on Gay-Lussite from 

 near Ragtown, Nevada (18GG), in which the occurrence of this mineral 

 in process of formation is described ; on Priceite, a new Borate of Lime 

 (1837) ; on Platinum and Iridosmine at the Cherokee Gold Mine, 

 California (1837) ; on Tellurium Ores of Colorado (1874) ; on the 

 Occurrence of Gold with Sheelite in Idaho (1877) ; on Jarosite in 

 Arizona (1879) ; on Vanadates, Chromates, and Tungstates in Arizona 

 (1881) ; and on the Iron Mountain of Durango, IMexico (1882). Of 

 equal interest were his papers on Meteorites, as those of Burlington, 

 N. Y., of Lockport, N. Y., of Texas, of Concord, N. II., and of Shingle 

 Springs, Cal. He also wrote on points in geology and physical optics, 

 on the illuminating powers of gas, and on the photographic effect of 

 the voltaic arc. 



On the centennial of the discovery of oxygen gas by Priestley, cele- 

 brated at Northumberland, Pa., August 1, 1874, Professor Silliman 

 prepared a full list of American contributions to chemistry up to the 



