734 INDEX TO VOLUME XXX 



PAGE 



Paleontology, An Introduction to. By A. Morley Davies. Review by 



C. L. F 651 



Paleozoic Bituminous Coals, Structure in. By Reinhardt Thiessen. 



Review by A. C. N 718 



Paleozoic Rocks of the Canton Quadrangle, The. By G. H. Chadwick. 



Review by J. F. W 415 



Patton, Leroy. In Support of Gardner's Theory of the Origin of 



Certain Concretions 700 



Pennsylvanian Stratigraphy of North Central Texas. By Raymond C. 



Moore and Frederick B. Plummer 18 



Perkins, George H., et al. Eleventh Biennial Report of the State 



Geologist on the Mineral Industries and Geology of Vermont. 



Review by A. C. McF 86 



Petrogenesis, The Reaction Principle in. By N. L. Bowen. . . . 177 

 Petrological Abstracts and Reviews . . 170,252,319,401,482,632,703 

 Physical Chemistry of the Crystallization and Magmatic Differentiation 



of Igneous Rocks, The. V. By J. H. L. Vogt 611 



Physical Chemistry of the Crystallization and Magmatic Differentiation 



of Igneous Rocks, The. VI. By J. H. L. Vogt .... 659 

 Physiographic History of Northeastern Ontario, An Outline of the. 



By W. H. Collins 199 



Phosphate Depostis of South Australia, The. By R. Lockhart Jack, 



B.E., F.G.S. Review by A. C. McF 176 



Phytosaur from the Trias of Arizona, A New. By Maurice G. Mehl . 144 

 Pleistocene History of the Lower Wisconsin River, The. By Paul 



MacCHntock 673 



Pleistocene Marine Submergence of the Hudson, Champlain and St. 



Lawrence Valleys. By Herman L. Fairchild. Review by 



J. F. W 504 



Pleistocene MoUusca from Northwestern and Central Illinois. By 



Frank Collins Baker. 43 



Possible Silurian Tillite in Southeastern British Columbia. By Francis 



P. Shepard 77 



Post-Glacial Lakes in the Mackenzie River Basin, Northwest Territories, 



Canada. By A. E. Cameron 337 



Potash Recovery at Cement Plants. By Alfred W. G. Wilson. Review 



byE. S. B 412 



Pre-Cambrian of Western Patricia, The. By E. M. Burwash. . . 393 

 Pre-Cambrian Rocks of the Canton Quadrangle, The. By James C. 



Martin. Review by J. F. W. . 416 



Principles Governing the Production of Oil Wells, Some. By Carl H. 



Beal and J. O. Lewis. Review by W. O. G 264 



Problem of the St. Peter Sandstone, The. By Charles Laurence Dake. 



Review by R. D. S 646 



