112 Scientific Intelligence. 



lode deposits and as bedded masses in the sedimentary and intru- 

 sive rocks. They lie chiefly in the sedimentary rocks in close 

 proximity to igneous intrusions and have been mostly deposited 

 by means of replacement action. w. e. f. 



11. Oil- Finding ; An Introduction to the Geological Study 

 of Petroleum ; by E. H. Cunningham Craig; with an Introduc- 

 tion by Sir Boverton Redwood; pp. x, 195, 13 plates, 18 figures. 

 New York, 1912 (Longmans, Green & Co.) ; London (Edward 

 Arnold). — This small book has been written in order to emphasize 

 the importance of the geological structure of oil fields and to 

 assist the field geologist, the manager, and the investor in under- 

 standing the geological facts. It treats briefly of the origin of 

 petroleum; its migration under ground after formation and the 

 manner in which it is stored in the rock strata. It describes the 

 characteristic geological structures of oil fields and the indications 

 of the petroleum, both on the surface and in the bore holes. 

 It explains the proper location of oil wells, and closes with two 

 brief chapters of hints to the young field geologist who is to work 

 in oil regions. It is a well-written and well-illustrated book and 

 should prove a valuable one in its field. w. e. f. 



12. .Examination of Prospects; A Mining Geology; by C. 

 Godfrey Gunther. Pp. vi, 222, 19 figures. New York, 1912 

 (McGraw-Hill Book Co.). — This hand-book is intended, as stated 

 in the preface, " to present the practical side of economic geology 

 concisely and in convenient form." The following chapter head- 

 ings will serve to give an idea of the scope of the book: Mining 

 Examination ; Structural Geology ; Structural Features of Ore 

 Deposits ; Primary Ores and their Distribution ; Types of Pri- 

 mary Ore Deposits ; Primary Ore Shoots ; The Primary Altera- 

 tion of Wall Rocks ; Alteration by Surface Agencies ; Residual 

 Ores and their Distribution ; Secondary Ores and Ore Shoots ; 

 Outcrops. The book properly places the emphasis upon known 

 facts and touches only briefly theoretical considerations. It is 

 amply and well illustrated and should prove a material help 

 to the general mining engineer and prospector. w. e. f. 



13. Building Sto?ies and Clay- Products. A Handbook for 

 Architects ; by Heinrich Ries. Pp. xv, 415; 59 plates, 20 

 figures. First edition. New York, 1912 (John Wiley & Sons); 

 London (Chapman & Hall, Ltd.). — The present author is well 

 known for his numerous and important contributions particularly 

 to matters concerning the clay industries of the country. In 

 this volume he covers a field somewhat broader in extent, present- 

 ing facts that are necessary for the knowledge of the architect 

 with reference to the prominent building stones, as well as bricks, 

 terra cotta, tiles, etc. While the object and scope of the volume 

 do not permit exhaustive treatment, a wide range of important 

 facts is presented in a clear and simple form, so that the whole 

 work is an excellent summary of the subject which it covers. It 

 is profusely illustrated and fills' admirably the field for which it 

 is designed. 



