632 REVIEWS 



In districts where quadrangles have been surveyed topographically, 

 full-size lithographed sheets are used to present the geologic features. 

 Many of the figures are graphic sections showing the physical character- 

 istics of the coal beds. A large geologic map of Missouri is included. 



It is estimated that the original coal tonnage of the state, not includ- 

 ing beds or parts of beds less than 14 inches thick, was 79,362,016,000. 

 One hundred and ten million tons have been mined and perhaps 50,000,- 

 000 tons have been left in the ground as pillars. Probably 60 per cent 

 of the remaining coal can be recovered, giving Missouri a future produc- 

 tion of 47,702,108,400 tons. 



The value of such a report to the commercial interests of Missouri 

 can scarcely be overestimated. The author is to be congratulated on the 

 useful and attractive form in which so much detailed information is 

 made available. 



F. H. K. 



