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Geology of Westeni Ore Deposita by Arthur Lakes, Late 

 Professor of Geolopy in the Colorado School of Mines, Author 

 of "Prospecting for Gold and Silver," etc. — Denver, Coló. 

 The Kendrkk Book ovd Stationary Co. 1905. 8" illustr. $2.50. 



The tirst edition of this work wa.s piiblished many years ago, under 

 the title "Geology of Colorado aiid Western Ore Deposits," at a time 

 when many of our now leading camps were just discoverod and but little 

 known. This edition was qiiickly exhausted. The present work under a 

 broader title and scope, has been so much remodeled and brought up to 

 date, that it may b<> considered in the light of a new work, rather than a 

 new edition of the oíd. 



A marked feature of the book is its copious illustration, most of the 

 sketches bei» g from the author's pencil. and taken in the field. The cuts 

 are chiefly illustrative of some apecial fonn of ore deposit or of some geo- 

 logical phenomenon. 



The first part of the liook is devoted to a general description of the 

 geologj' of the ore-bearing regions, and to special geological phenomena 

 beañng on them T}-pical Colorado and westem camps are described, 

 individual mines being mentioned only in so far as they illustrate geolo- 

 gical principies, (^oloi-ado has a full share given to it, partly because the 

 wñter is most conversant with is own state, and pai-tly because a local 

 description goes far toward a general understanding of the subject. Typ- 

 ieal examples of the mining regions of the other westem states are given 

 80 that the work may justify its title as a comprehensivo ene of the Geol- 

 ogj' of Westem Ore Deposits. 



To further assist the reader. a list and description of the principal 

 ores and minerals. together with a glossary, is added. 



The book is of convenient size and neat appeai'ance. It deserves a 

 place in the libraiy of every peison who is interested in mining. 



Department of Commerce and Labor. — Report of the Su- 

 perintendent of the Coast and Geodetic Survey showing the 

 progresa of the work from July 1, 1903, to June 30, 1904. — 

 Washington. Government Priting Office. 1904, 4° 774 p. 

 illustr. (O. H. Tittman, Superintendent ). 



Contenta of appendices : 1. Details of fíeld operations. — 2. Details of 



