192 REVIEWS 
dynamic action on petroleum occurrence, gas pressure and oil recovery, — 
and petroliferous provinces. : 
While a short chapter deals with the subject of maps and logs and 
explains the meaning of structural contours, there is no detailed dis- _ 
cussion of methods of field work in petroleum geology, nor does the © 
book touch the ground of petroleum technology already adequately q 
covered by other works. | 
The general features of petroleum occurrence mentioned above ~ 
occupy the first one hundred and ninety-four pages. Nearly three — 
hundred pages are devoted to summaries of petroleum occurrence in the ~ 
various fields in the United States, and about one hundred and twenty 
pages to foreign occurrences. 
