igo 



REVIEWS 



are issued on separate sheets, so that they may easily be made of immedi- 

 ate and permanent educational value in the laboratories of geography 

 and geology, and each such laboratory in America should make arrange- 

 ments for at least one complete copy of the atlas before the edition is 

 exhausted. 



The general plan of the atlas includes : 



1. Forms produced by disintegration and the action of gravity: mechani- 

 cal and chemical disintegration; rock-waste, landslides, etc. 



2. Elementary forms produced by erosion by running water: ravining, 

 erosion in swirls, torrents, etc. 



3. Complex forms produced by erosion by running water: gorges, valleys; 

 maturity more or less advanced; successive cycles. 



4. Forms affected by the character of the rocks: massive, slaty, incoherent, 

 permeable, and soluble rocks. 



5. Forms produced by erosion of rocks of various structures: surface 

 features associated with folding and faulting; epirogenic movements. 



6. Forms connected with glacial action: existing glaciers, erosion and 

 deposit; ice age. 



7. Forms of desert regions: wind erosion; dunes, etc.; complex desert 



forms. 



8. Coastal forms: simple forms due to erosion and accumulation; changes 



of shore line. 



9. Volcanic land forms: accumulation (cones, lava flows, etc.), forms 

 produced by denudation. 



The completed atlas will contain 10 series of 6 parts each. Each 



series will contain from 45-48 plates, so that the atlas will include 450-80 



plates and from 1800 to 1900 pages of descriptions, illustrated with maps 



and diagrams. 



W. W. A. 



The Fuels Used in Texas. By William B. Phillips and S. H. 



Worrell. Bull, of the University of Texas, No. 307. 1913. 



Pp. 287, pis. 22. 

 The fuels used in Texas are natural gas, oil, sub-bituminous coal, 

 and lignite. All these fuels are produced in the state. For the year 1 9 1 2 

 the production of oil was 12,000,000 barrels, 1,200,000 tons of sub- 

 bituminous coal, and 990,000 tons of lignite. 



The sub-bituminous coal is mined in three fields. In the north- 

 central part of the state Carboniferous beds carry coal, and on the Rio 

 Grande in two localities coal is worked in beds that are probably Cre- 

 taceous. The coal seams are not more than two feet thick in any place. 



