296 REVIEWS 



ends with chapters on the methods of mining and the statistics of the 



diamond-mining industry. 



R. T. C. 



Geographical Essays. By William Morris Davis. Edited by 



Douglas Wilson Johnson, Pp. 777, 130 text figures. Boston: 



Ginn & Co., 1909. 



An endeavor has been made in this volume to meet the growing demand 



for an edition of Professor Davis' most important geographical essayss 



Twenty-six of these essays have been reprinted from the pages of the variou. 



publications in which they originally appeared and grouped under two 



heads: Part I, embracing twelve educational essays, and Part II, fourteen 



physiographic essays. The high character of these essays is so familiar to 



all geologists and geographers that special comment seems superfluous. 



R. T. C. 



The Cement Resources of Virginia, West of the Blue Ridge. By Ray 

 S. Bassler, Ph.D. Bulletin No. 11 A, Virginia Geological 

 Survey. Pp. 309, 30 plates, and 30 text figures. Charlottes- 

 ville, 1909. 

 This report deals essentially with the limestones and shales of Appa- 

 lachian Virginia — in other words, with the materials there present which 

 may be used in the manufacture of cement. The Cambro-Ordovician 

 limestones have received the greatest attention, though the post-Ordovician 

 cement materials are also discussed toward the close of the book. A large 

 number of chemical analyses of the limestones from the various localities 

 are given. Since practically nothing concerning the Paleozoic fossils of 

 Virginia has appeared in the literature, the author has included plates 

 portraying some of the characteristic species employed in the discrimination 

 of the different formations. The report is well illustrated. 



R. T. C. 



