Geology and Natural History. 441 



mento, 1890. — The tenth Mineralogical Report of California, 

 issued by Wm. Irelan, Jr., State Mineralogist, is a weighty vol- 

 ume of nearly 1000 pages, illustrated by many plates, maps and 

 profile sections, and accompanied by a large geological and min- 

 eralogical map of the State on a scale of 12 miles to the inch. 

 Detailed accounts are given of the mining operations in the 

 several counties ; these chapters are contributed by a number of 

 different observers, including W. A. Goodyear, H. DeGroot, E. B. 

 Preston, J. B. Hobson, M. Angell, W. L. Watts and others. 

 The colored geological map mentioned is compiled from the 

 twenty-five atlas sheets by the State Engineering Department 

 which are on a scale of 4 miles to the inch. 



15. Allgemeine Ghemische Miner alogie von Dr. C. Doelter. 

 277 pp. 8vo. Leipzig, 1890 (Wm. Engelmann). — The fact that 

 the author of this work has already made many important con- 

 tributions to the subject of mineral chemistry both on the ana- 

 lytical and synthetic sides gives us a right to expect a very clear 

 and thorough presentation of the subject from his pen and in 

 this he has not disappointed us. The successive chapters are 

 devoted to the general chemical relations of mineral compounds, 

 with a discussion of isomorphism, isogonism, etc. ; chemical analysis 

 both in the wet and dry way ; mineral synthesis ; the alteration 

 of minerals and their formation in nature, and finally a summary 

 of all prominent mineral species with a statement of their compo- 

 sition. Of these various topics, we turn with most interest to the 

 chapters which give an excellent summary of the present state of 

 knowledge of artificial minerals, a subject which has been rapidly 

 developed during the past two decades and one in which the 

 author's contributions are not inferior to those of any other German 

 mineralogist. 



16. Index der Krystallformen der Miner alien, von Dr. Victor 

 Goldschmidt. — The announcement of the publication numbers 4 

 and 5, of volume iii, made in the March number, is quickly fol- 

 lowed by the appearance of number 6, including the species from 

 Xanthokon to Zunyite. This concludes the work with the exception 

 of a supplementary number which is to be devoted to errata, etc. 



17. Gray's Manual of Botany; reprint of the sixth edition, 

 edited by Dr. Sereno Watson and Prof. J. M. Coulter, 1891. 

 — In the revision of Gray's Manual which appeared about a year 

 ago, the editors earnestly solicited information of any additions 

 or corrections which might appear necessary. In generous re- 

 sponse to this request a number of botanists in different parts of 

 the country have reported such additional details or alterations 

 as, from their personal observation, they judged desirable. In 

 the second issue of the sixth edition, which has recently been put 

 upon the market, and to which we take pleasure in calling atten- 

 tion, these additional details have received due recognition. A 

 number of minor alterations have been made in the plates of the 

 text, and are thus scattered through the work. Such changes, 

 however, have naturally been limited ; and the chief new feature 



