REVIEWS 679 
with what is commonly included under physical geography and to 
adapt the book to a high-school course extending over a half-year. 
A supplementary volume is to be added for the use of schools which can 
devote more time to the subject. 
The keynote of the book is the dependence of human life upon 
natural conditions. In the second part, which is entitled ‘‘ Economic 
Geography,”’ we find an excellent preparation for a study of conserva- 
tion, the importance of which is now beginning to be realized. This 
section follows logically and naturally the physical geography, its four 
chapters being devoted to: natural resources and food supply; clothing 
and construction materials; heat, light, and power; and manufacture, 
trade, and transportation. 
The book has an unusual number of maps, both in contour and in 
color; and its other illustrations, while particularly well chosen, are 
poorly reproduced. Specially interesting are the cloud photographs 
and the series chosen to illustrate plant regions. Geographical divisions 
used in descriptions are natural rather than political, which is a decided 
advantage. W. H. H. 
Rocks and Their Origin. By G. A. J. Cote. Cambridge University 
Senles Ok 2. sb vices: 
There is always a danger that because of the special interest of the 
unusual and bizarre, the common objects in Nature’s storehouse will 
be neglected. In this little manual Professor Cole has invested lime- 
stones, sandstones, and shales with interest while teaching important 
facts which are quite likely to be overlooked. Though written in an 
attractive style, the book’s appeal will be strongest to the serious student 
of geology, for it is surprising how much has been compressed within 
its pages. The latter third is devoted to the igneous rocks and meta- 
morphic rocks and treats of broad problems of origin and differentiation. 
The book is thoroughly up to date and concludes with a very valuable 
series of references each referred to by a number in the text. 
We EL: 
The Mining Districts of the Western United States. By JAMES M. ~ 
Hitt. Bull. No. 507, U.S. Geological Survey. Washington, 
OA, JED; Rovoys jOliss a0. 
A catalogue of the mining districts in the western part of the United 
States, using as a basis the map compiled by Lindgren in 1907. The 
districts are arranged by states, with subdivisions by counties. An 
alphabetical list is found in the index. In each district the location, 
