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appropriate statistics are given. Withal, the book is not too long to be 

 easily read in the course of the journey. 



Although technical terms are consistently avoided, with the excep- 

 tion of a few essential ones which are explained in a brief glossary, 

 a large amount of geological information of general interest is included. 

 The numerous photographs are exceptionally well chosen, and well 

 adapted to awaken interest in geology. There are 25 admirable maps 

 on a scale of 1 : 500,000, showing topographic, geologic, and cultural 

 features, and mounted in a manner convenient for the reader. 



This bulletin covers the route followed by the Union Pacific from 

 Omaha to Ogden, that of the Southern Pacific from Ogden to San Fran- 

 cisco, and that of the Oregon Short Line fiom Ogden to Yellowstone 

 National Park. It is obtainable from the Superintendent of Documents, 

 Washington, D.C., for fifty cents, postage free. 



C. W. T. 



Gold on the North Saskatchewan River. By J. B. Tyrrell. Cana- 

 dian Mining Inst., Toronto, 1915, pp. 68-81. 

 Summarizes the general geology of the region, and describes the 

 occurrence of gold in the gravels of the stream. The gold is said to be 

 most abundant from Goose Encampment to Beaver Lake Creek, a dis- 

 tance of 130 miles. Some gold has been recovered from gravel taken 

 out for use on the streets of Edmonton. 



A. D. B. 



Die mikroscopische Untersuchung der Erdagerstatten. By Georg 

 Berg. Berlin, 1915. Pp. 198, figs. 88. 

 A book for use in the laboratory. The work is divided into four 

 parts, as follows: (I) optical and microchemical methods, covering 

 opaque and transparent minerals, reactions for the identification of 

 compounds and elements, chemically and by means of anlauf farben; 

 an appendix deals with manipulation, separation, and preparation of 

 material, etc.; (II) microscopic characters of the more important ore 

 and gangue minerals; in this section ^he minerals discussed are grouped 

 according to crystal system; in addition to their appearance under the 

 microscope, the more important physical characters are given. Asso- 

 ciated minerals are usually mentioned; (III) the microscopic structure 

 on the important types of ore deposits; a large number of figures illus- 

 trate typical sections of the various kinds of deposits; the grouping is 



