Ruschenberger.J 1—0 [Nov. 6, 



He was prominently active in the work of the Institute, de- 

 livered courses of lectures on chemistry before its classes, 

 assisted in the management of its public exhibitions, served on 

 several of its standing and on many of its special committees, 

 the most notable of which was one on tests of the efficiency 

 of dynamo-electric machines,* and another on the dangers of 

 electric lighting.f 



At the celebration of the semi-centennial anniversary of the 

 foundation of the society, February 5, 1814, in the Musical Fund 

 Hall, he delivered an eloquent address, narrating in a general 

 way a history of scientific discoveries and their practical appli- 

 cations in the half century, and indicating how the work carried 

 on during that period by the Institute had contributed to the 

 progress of science and the diffusion of knowledge. J 



Near the close of his thirtieth year he married, March 13, 

 1843, Miss Fanny Montgomery, a daughter of Mr. Joseph S. Lewis, 

 a gentleman who was prominent among those who established 

 the city's water-works at Fair mount. 



In the session 1841-42, on invitation, he completed the course 

 of chemical instruction at the University of Virginia which had 

 been interrupted by sickness of the professor, Dr. John P. 

 Emmet, from which he did not recover. Dr. Rogers was elected 

 in his place, Professor of General and Applied Chemistry and 

 Materia Medica, in March, 1842, and discharged the duties of the 

 office satisfactorily to all concerned during ten years. In May, 

 1852, he was a representative of the University of Virginia at 

 the meeting of the American Medical Association in Richmond, 



* Journal of the Franklin Institute, p. 1878, lxxv, pp. 303-378. 



t Journal of the Franklin Institute, 1881, lxxxii, pp. 401-408. 



J Commemorative Exercises at the Fiftieth Anniversary of the Franklin 

 Institute of the State of Pennsylvania for the Promotion of the Mechanic Arts. 

 Held on Friday evening, February 6, 1874, at the Musical Fund Hall. Hall of 

 the Institute, Seventh street, below Market street, Philadelphia, 1874. 8vo, 

 pp. 96. 



and talents he has devoted to the service of this Institute, and we indulge the 

 hope that in future as in the past, it may have the benefit of his extensive re- 

 search and great experience " 



At the stated meeting, September 7, 1881. the President announced the death 

 of Prof. Robert E. Rogers, and that the Board of Managers had appointed 

 Messrs. J. E. Mitchell, E. J. Houston and [saac Norris, Jr., a committee to suit- 

 ably express the sentiments of the Board; and, on motion, appointed Dr. G. M. 

 Ward and Dr. W. H. Wahl, to co-operate with the committee. Their report is 

 published in the Journal, p. 387, lxxxviii, 1884, 



