Geology and Natxiral History. 401 



15. Jadeite from Thibet, by Max Bauer, Jahrb. ftlr Min., 

 1896, i, p. 85. — In studying some specimens of jadeite from an 

 unknown locality in Thibet, Prof. Bauer has made the very inter- 

 esting discovery that the mineral is a component of a rock com- 

 posed of jadeite, plagioclase and nephelite ; at times the jadeite 

 predominates to the extent of practically supplanting the other 

 components. The author remarks that if the jadeite at this 

 locality is, as elsewhere, a member of the family of crystalline 

 schists, then we have here an entirely new method lor the occur- 

 rence of nephelite, until now restricted to eruptive rocks. 



It appears to us, however, that this interesting occurrence of 

 nephelite may prove to be of great importance in explaining the 

 origin of jadeite, whose significance in the crystalline schists has 

 never been understood, and it may also furnish one explanation 

 why, among all the varieties of metamorphosed igneous rocks 

 occurring among the crystalline schists, those containing nephe- 

 lite have not been found. l. v. p. 



16. A Dictionary of the Names of Minerals including their 

 History and Etymology ; by Albert H. Chester. 320 pp., 

 8vo. New York, 1896 (Wiley & Sons). — The author gives in 

 this work, to which it is evident that he has devoted a vast 

 amount of careful, patient labor, the most complete history of the 

 names of mineral species that has ever been attempted. How 

 fruitful his efforts have been will be appreciated from the fact 

 that of nearly five thousand names included, full information 

 with reference to the original authority, also derivation and so on, 

 is given in the case of all but about one hundred and fifty. This 

 woi*k will be highly valued by all mineralogists interested in the 

 history of their science, and will be useful to many others, includ- 

 ing those concerned with the etymology of English words in 

 general. 



17. 3Iineralogie de la France et deses Colonies: Description 

 physique et chimique des Mmeraux, Etude des conditions geolo- 

 giques de leurs gisements ; par A. Lacroix. Tome Premier (2 

 Partie), 723 pages. Paris, 1895 (Baudry et Cie,). — The first part 

 of Professor Lacroix's important work was noticed nearly three 

 years since (vol. xlvi, p. 76), and its originality in scope and 

 method remarked upon. The part now issued concludes the first 

 volume and carries the subject on from the micas through the 

 pyroxenes and amphiboles. All interested will look forward with 

 interest to the final completion of the entire work. 



18. Mineralogy ; by Frank Rutley. Eighth edition, revised 

 and corrected, 240 pp. London, 1887 (Thomas Murby). — This 

 little book must have been an aid to many in acquiring a knowl- 

 edge of elementary mineralogy, for siuce its first appearance it 

 has gone through numerous revisions and the eighth edition is 

 now given to the public. The various subjects embraced under 

 general mineralogy are treated concisely in the first seventy pages 

 and the remainder of the book is given to the description of 

 species. 



