H2 Heviews — Short Notices, chiefiy Mineralogical. 



III. Fumarolic deposits. Metallic oxides, etc., in clefts in lavas. 



IV. Gas - aqueous (pneumato - hydato - genetic) deposits. Igneous 



emanations or primitive water mingled with ground-waters. 



A. Filling deposits. 



B. Replacement deposits. 



V. Meteoric waters (surface-derived). 



A. Underground. 



B. Surficial. 



VI. Metamorphic deposits. Ores concentrated from older rocks by 



dynamo- and regional-metamorphism. 



V. — Manual of the Chemical Analysis of Rocks. By Henry S. 

 Washington, pp. ix, 183. (New York, John Wiley & Sons ; 

 London, Chapman & Hall, 1904. Price 8s. 6d. net.) 



THE object and scope of this work are well expressed by the first 

 paragraph of the preface, which may, therefore, be quoted in 

 full : — " The object of this book is to present to chemists, petro- 

 logists, mining engineers and others who have not made a particular 

 study of quantitative analysis, a selection of methods for the 

 chemical analysis of silicate rocks, and especially those of igneous 

 origin. While the publication of such a work may seem superfluous 

 in view of the existence of Hillebrand's treatise on this special 

 topic, yet justification may be found in the fact that the latter is 

 intended, not so much for one who is not very conversant with the 

 subject, as for the practised analyst, to whom it is an indispensable 

 guide." 



With the exception of a few of the rarer chemical elements, the 

 ground covered is the same as in Hillebrand's " Some Principles 

 and Methods of Rock Analysis " (Bull. U. S. Geol. Surv., No. 176, 

 1900), which is the standard work on the subject. Fewer methods 

 are, however, given, but these are described in greater detail so far 

 as details of manipulation are concerned. A few figures of 

 apparatus, such as are given by Hillebrand, would have added to 

 the value of the book. 



While, of course, it is of extreme importance to have analyses of 

 rocks, yet it is still more important that these analyses should be 

 accurate ; and it is to be hoped that the apparent simplicity of the 

 methods, as clearly stated in the book in such minute detail, will 

 not lead to the multiplication of unreliable analyses by unskilled 

 analysts. 



VI.— Die Kkistallinen Sohiefer. I. Allgemeiner Teil. By Dr. U. 

 Grubenmann. pp. 105, with 7 text - figures and 2 plates. 

 (Berlin : Borntraeger, 1904. Price 3 M. 40 Pfg.) 



THE author of this book, who is Professor of Mineralogy and 

 Petrology in the University of Zurich, has for many years 

 made a special study of the crystalline schists of the Alps, in which 



