1893.] Scientific News. 315 
Marburg, where he received the degree of Ph. D. in 1846. For three 
years he acted as assistant to Professor Bunsen, and soon afterward came 
to the United States, where he has since resided 
In 1872 he was called to the chair of chemistry and mineralogy in 
the University of Pennsylvania, which place he held up to within a few 
years ago. He had also held the office of chemist to the Geological 
Survey of Pennsylvania, and also to the Board of Agriculture of this 
State. Professor Genth was a member of many scientific societies in 
the United States, and was elected in 1872 to membership to the 
National Academy of Sciences. He had no superior in this country 
as an analytical chemist, and he greatly enriched the literature of 
chemistry with his very many and careful analyses of minerals. His 
name is associated with the ammonia cobalt bases, which he discovered 
in 1846, and, in joint authorship with Dr. Wolcott Gibbs, he contributed 
to the “Smithsonian Contributions to Knowledge,” a monograph on 
“ Researches on the Ammonia Cobalt Bases” (Washington, 1856). 
Professor Genth was the author of nearly one hundred separate 
papers on subjects in chemistry and mineralogy, and published Tabel- 
larische ubersicht der Uichtigsten Reactionen welche Basen in Salzen 
zeigen (Marburg, 1845) ; also the same in relation to “ Acids” (1845) ; 
his “ Minerals of North Carolina,” being appendix “ C ” of the “ Report 
on the Geology of North Carolina” (Raleigh, 1875). He also was the 
author of “ First and Second Preliminary Reports on the Mineralogy 
of Pennsylvania” (Harrisburg, 1875-6) and “‘ Minerals and Mineral 
Localities of North Carolina” (Raleigh, 1881). 
Nrxouat Ivanovircn Koxsnarorr, the well-known Russian miner- 
alogist, died at St. Petersburg, January 2, 1893. During his early 
years he lectured on geology and physical geography, but later on 
devoted himself to the description of Russian minerals of which he dis- 
covered, and described many new ones. His chief works are embod- 
ied ineleven large quarto volumes of Beiträge zur Mineralogie Russlands, 
illustrated with numerous plates. The twelfth volume was in type 
when he died. He was a member of the St. Petersburg Academy of 
_ Sciences, and many of the scientific bodies of Western Europe elected 
him corresponding or honorary member. 
—The address delivered by Professor Virchow on his assumption of 
the office of Rector of the University of Berlin, has been issued by the 
