702 INDEX TO VOLUME XXXI 



PAGE 



Story of the North Star State, The. By D. E. Willard. Review by 



A. H. B 263 



Stratigraphy of the Pennsylvanian Formations of North-Central Texas. 



By F. B. Plummer and R. C. Moore. Review by A. H. B. . . 260 



Stromboli, Persistence of Vents at, and Its Bearing on Volcanic Mechan- 

 ism. By Henry S. Washington. Review by Albert Johannsen . 80 



Sturm, Fr. Vor Verdun. Book Notice 616 



Summer in Greenland, A. By A. C. Seward. Review by T. C. C. . 253 



Siissmilch, C. A. An Introduction to the Geology of New South Wales. 



Review by R. T. C 162 



Swartz, C. K., Prouty, W. F., Ulrich, E. O., and Bassler, R. S. 



Silurian. Review by E. M. Kindle 682 



Talc Production, Progress in. By Elbridge C. Jacobs. Review by 



A. C. McF 167 



Thwaites, F. T. The Paleozoic Rocks Found m Deep Wells in Wiscon- 

 sin and Northern Illinois 529 



Tieje, A. J. The Red Beds of the Front Range in Colorado: A Study in 



Sedimentation 192 



Tin Resources of the British Empire, The. By N. M. Penzer. Review 



by E. S. B ■ . . ; 86 



Turner, Homer G., and Randall, H. R. A Preliminary Report on the 



Microscopy of Anthracite Coal 306 



Uhlemann, A., Weise, E.,and. Sektion Auerbach-Lengenfeld. Review 



by Albert Johannsen 83 



Untersuchungen iiber die Tektonik der Lessinischen Alpen und iiber die 

 Verwendung statistischer Methoden ui der Tektonik, I. Teil. By 

 J. Pia. Author's Abstract $27 



Van Baren, J. On the Correlation between the Fluvial Deposits of the 

 Lower-Rhine and the Lower-Meuse in the Netherlands and the 

 Glacial Phenomena in the Alps and Scandinavia. Book Notice . 166 



Venerable Climatic Fallacy, A. By T. C. Chamberlin .... 179 



Verdun, Vor. Von Fr. Sturm. Book Notice 616 



Vermont, Report of the State Geologist on the Mineral Industries and 



Geology of, 1919-1920. Review by A. C. McF 166 



Verwertung Geologischer Karten und Profile. Zweite Auflage. Von Fr. 



Schondorf. Book Notice 166 



Vogt, J. H. L. The Physical Chemistry of the Crystallization and 



Magmatic Differentiation of Igneous Rocks .... 233, 407 



von Huene, Friedrich. Die Ichthyosaurier des Lias und ihre Zusammen- 



hange. Review by A. S. Romer 687 



