392 General Notes. [ April, 
MINERALOGY AND PETROGRAPHY.! 
RECENT TEXT-BOOKS OF MINERALOGY AND PETROGRAPHY.—The 
appearance of the second edition of Professor E. S. Dana’s well 
known Text-book of Mineralogy,’ containing over fifty pages of 
new matter in the form of supplementary chapters, brings this 
admirable introduction to the science fully up to date, as well in 
respect to its treatment of the newest methods and apparatus for 
mineralogical investigation as in the completeness of the list of 
species mentioned. 
Professor Gustav Tschermak’s excellent Lehrbueh der Mineral- 
ogie, completed only near the end of 1883, fills the same place ni 
the German language that Dana’s text-book does in English, and 
fills it so well that a second revised edition has already appeared,’ 
having the imprint 1885. This work is especially strong in its 
treatment of the physical, particularly the optical, properties of min- 
erals, as well as their modes of origin and occurrence. Consider- 
able space is also devoted to their chemical relations, and an at- 
tempt made to classify them according to a scheme based some- 
what on the periodic arrangement of the elements. The descrip- 
tion of the species is, however, often too meager even for a text- 
book, many important, minerals being mentioned only by name. 
Professor A. de Lapparent, of Paris, author of the recent Traité 
de Géologie, has also just issued a mineralogical manual entitled 
Cours de Minéralogie* A large proportion of this work is de- 
voted to the treatment of crystallography, in which the cumber- 
some system of notation suggested by Haiiy and developed by 
évy and Des Cloizeaux, is retained, as indeed it is in nearly all 
French works on mineralogy. The arrangement of the species 
is merely in accordance with the frequency of their occurrence. 
In other words the classification is purely geological, and it is 
among geologists that the work will probably prove to be of the 
greatest use. 
The second volume of Hilary Bauerman’s Mineralogy, de- 
voted to the description of species, is very unsatisfactory. Mu 
that is very important, especially many results of the best recent 
mineralogical work, has been altogether disregarded, and the 
author conveys the impression of being by no means thoroughly 
acquainted with the newest methods or the latest discoveries in 
the science of which he treats, 
_ Dr. Heinrich Baumhauer, well known for his researches on the 
figures artificially etched on crystal planes by chemical reagents 
oo by Dr. Geo, H. WILLIAMS of the Johns Hopkins University, Baltimore, 
~ ? Text-book of Mineralogy, new and revised edition, 1883 (Wiley & Sons). 
- ee ch der Mineralogie. Zweite verbesserte Auflage. Wien, 1885. 
_ _ *Cours de Minéralogie. Par A, de Lapparent. 8vo, pp. 560, 519 cuts and one 
mas colored plate. Paris (Savy) 1884. PI 59; 5 
~ *Text-book of descriptive Mineralogy. Text-books of science series, 1884. 
