172 Scientific Intelligence. 



products, by Bruno Kerl; translated from the German by W. 

 T. Brannt. Second American edition, edited with extensive 

 additions by F. Lynwood Garrison. 354 pp. 8vo. Philadel- 

 phia, 1SS9, (Henry Carey Baird & Co.). — This standard and well 

 known work on assaying appears now in its second American 

 edition, increased in completeness and value by the large amount 

 of new and useful matter added by the editor. It gives a clear 

 and concise statement of the methods employed in assaying. 

 The first quarter of the work is devoted to a general discussion 

 of the mechanical manipulations, the chemical processes, assay 

 furnaces, implements and reagents, and the remainder gives the 

 special methods applicable to the different metals. The figures 

 are models of clearness and the whole execution reflects credit 

 upon the publishers as well as upon the editor. 



Catalogue of Fossil Pishes of the British Museum, Part I, containing the Elas- 

 mobranchii by Arthur S. Woodward, F.G.S., P.Z.S., 474 pp. 8ve, with 17 plates. 

 London, 1889. 



La Nouvelle Guinea, Hie Notice, Le Fleuve Augusta, by Prince R. Bonaparte. 

 16 pp., with a map. Paris, 1887 ; and IVe Notice, Le G-olfe Huon, 62 pp., with 

 maps. — By the same: Note on the Lapps of Finmark, Paris, 1886, 12 pp. 



Glaciation of British Columbia and adjacent regions, by G. M. Dawson (Geol. 

 Mag., Aug., 1888). 



OBITUARY. 



John Percy, M.D., F.R.S. — Dr. Percy, of the Royal School 

 of Mines, the distinguished metallurgist, author of an invaluable 

 series of treatises upon metallurgy, died June 19, 1889, at the age 

 of seventy-two. 



Maria Mitchell. — Miss Maria Mitchell, the astronomer, died 

 at Lynn, Massachusetts, on the 28th of June, having nearly fin- 

 ished her seventy-first year. The interest which her father, Mr. 

 Wm. Mitchell, of Nantucket, had in mathematics and astronomy, 

 and his telescope, led to the development of similar tastes in the 

 daughter. From the age of eighteen to thirty-eight she was 

 librarian of the Nantucket Athenreum ; but her spare time was 

 given to mathematical studies and astronomical observations, and 

 in October, 1847, she made the discovery of a comet, for which 

 she received a comet gold medal from the King of Denmark. In 

 her later astronomical work she devoted herself particularly to 

 the study of the satellites and surface of Jupiter. In 1865 Miss 

 Mitchell became Professor of Astronomy and Director of the Ob- 

 servatory at Vassar College, Poughkeepsie, N. Y., a position she 

 held, with honor to the institution, until January, 1888. 



Miss Mitchell was early elected a member of the American 

 Academy of Arts and Sciences of Boston. The degree of LL.D. 

 was conferred on her by Dartmouth College in 1852, and by 

 Columbia College in 1887. On ber return from Europe, where she 

 went in 1858 to see observatories, and met with a welcome from 

 many astronomers, she found a welcome back in the form of a 

 telescope purchased for her by American friends. 



