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This is a duodecimo volume of 165 pages, intended by the translator, who is Professor of Physical Science in the Polytechnic Institute, Brooklyn, X. Y., as a desirable supplement to the ordinary Academic course of geology and an easj- introduction to the larger treaties on Lithology. How far it will accomplish these objects depends largely upon the advancement made beforehand by the student in crystallography and microscopy, upon which to some extent the determination of rocks as taught in this work depends.- However, in most respects, it is plainly written, and well adapted to the wants not only of the class for whom it was prepared, but also for practical workers in the field. The introduction is a concise description of rocks, divided into Crystalline, Sedimentary and Eruptive, their origin, formation constitution and modifications. Part I. is devoted to the principal physical and chemical properties of the mineral species which compose the rocks, such as Feldspars and the minerals allied to them: the Micas, the Chloritcs or talcose Micas; Talc and Steatite; Amphiboles, as Hornblende, etc.; Pyroxenes; Mineral species occasionally appearing as essential elements of rocks, like Topaz, Tourmaline, Garnet, etc. Part II. is devoted to a description of rocks and the minerals which compose them, and consists of a more minute examination of the same classes or species named above with their dominating and essential elements and their accessory and accidental elements. In Part III., the author first presents the prominent characteristics of rocks which enable the student to refer any specimen under consideration at once to a certain group, and after that gives the method of determining its precise order and name. Part IV is translated from the elementary course of applied geology by M. Stanislaus Meunier, and gives the Dichotomic table for determining rocks. As an illustration of the manner adopted by the author, we reprint part of the chapter descriptive of Metallic Bocks in Part II. -The Western Review of Science and Industry, Vol. 1

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