Index to Volume XVIII 



Adams, Frank D. An Experimental Investigation into the Action of ' 

 Differential Pressure on Certain Minerals and Rocks, Employing 

 the Process Suggested by Professor Kick ..... 489 



. The Laurentian System in Eastern Canada. Review by 



E. R. L 287 



Aftonian Sands and Gravels in Western Iowa. By B. Shimek. Review 



by T. C. C. . 294 



Age of the Earth and the Saltness of the Sea, The. By H. S. Shelton 190 



Aguilera, Jose G. Catalogo de los temblores (Macroseismos) sentidos 

 en la Republica Mexicana durante los ahos de 1904 a 1908. Review 

 byW. H. H. . 194 



Alkaline Rocks, Origin of the. By Reginald A. Daly. Author's Ab- 

 stract 575 



Amphibian Footprints from the Mississippian of Virginia. By E. B. 



Branson . . . -356 



Analcite Basal from Rathjordan, Co. Limerick, On an. By G. T. 



Prior. Review by Clarence W. Russell . .481 



Analyses of Rocks and Minerals from the Laboratory of the U.S.G.S. 



By F. W. Clarke. Review by Charles J. Hares . . . 573 



Analysis of Silicate and Carbonate Rocks, The. By W. F. Hillebrand. 



Review by Albert D. Brokaw ....... 478 



Anthracolithic or Upper Paleozoic Rocks of Kansas and Related Regions, 



The. By Charles S. Prosser . .125 



Appalachian Folds of Central Pennsylvania, The. By RoUin T. Cham- 



berlin ........... 228 



Austin, Leonard S. The Metallurgy of the Common Metals, Gold, 



Silver, Iron, Copper, Lead, and Zinc. Review by W. H. E. . . 198 



Ball, Sydney H., and Millard K. Shaler. A Central African Glacier 



of Triassic Age ......... 681 



Baraboo Quartzite Range, Wisconsin, The Secondary Structures of 



the Eastern Part of the. By Edward Steidtman . . .259 



Barbier, Ph. Sur un caractere chimique differentiel des orthoses et des 



microclines. Review by F. C. Calkins ... . . 476 

 Basische Eruptivgesteine aus den Kitzbiichler Alpen. By Albrecht 



Spitz. Review by Albert Johannsen ..... 580 



Bassler, Ray S. The Cement Resources of Virginia, West of the Blue 



Ridge. Review by R. T. C. . . . . . . . 296 



Bastin, Edson S. Origin of the Pegmatites of Maine . . . 297 



777 



