792 INDEX TO VOLUME XX 
Volcanic Action, The Nature of. By Reginald A. Daly. Review by 
G. S. Rogers : ‘ : : j 
Von Zittel, Karl A. Grandzise der Paliontologic. II. Abteilung. 
Vertebrata. Review by S. W. W. : ; : i ; 
Vulkanischen Erscheinungen der Erde, Die. By Karl Schneider. 
Review by Albert Johannsen 
Washington, H. S., Whitman Cross, J. P. Iddings, L. V. Pirsson. 
Modifications of the Quantitative System of Classification of 
Igneous Rocks : Fy aie a Weis eae 
Water-worn Pebbles in Carbaniierous Sandstone. By William F. 
Prouty 
Watson, John. Emitcie Stones: PReaen by A. D. B 
Watts, W. W. Address Delivered at the Anniversary Meeting Of ihe 
Geological Society of London. Review by A. E. F. 
Weaver, Charles E. Geology and Ore Deposits ot the Blewett IERIE 
District. Review by A. E. F. 
White, David. Review of Lower Cretaceous of Maryland See 
Williston, S. W., and E. C. Case. The Permo-Carboniferous of 
Northern New Mexico se GAN OI at rele a eae a 
Wirt, Roane, and Calhoun Counties. By Ray V. Hennen. Review 
by A. E. F. 
Woloskow, A. Sehmelzversuches ber Breeare a suiaden fa 
Halogenverbindungen. Review by Albert D. Brokaw 
Woodward, Horace B. History of Geology. Review by W. H. H. 
Workman, Rachel. Calcite asa Primary Constituent of Igneous Rocks. 
Review by E. R. Lloyd . : : é } ; : : 
Wright, Craig, Bailey, Clough, and Flett. The Geology of Colonsay 
and Oronsay, with Part of the Ross of Mull. Review by Albert 
Johannsen Shad CRORE COMERS TS ge CLONE ua rhe REY ge anne 
Wright, Fred. Eugene. Microscopical Petrography from the ee 
tative Viewpoint : 
Wiilfing, E. A. Ueber die TichtbrecHune des Kanadabaleame: Re- 
view by Albert Johannsen 
Wurm, Adolf. Untersuchungen tiber den doologisekent Bau and ae 
Trias von Aragonien. Review by A. E. F. 
Yosemite (California), An Excursion to the, or Studies in the Formation 
of Alpine Cirques, “Steps,” and Valley “Treads.” By E. C. 
Andrews. Review by A. E. F. Smee 8 AMM det coe FS ae npn 
Younger Rock-Series of New Zealand, The. By P. Marshall, R. 
Speight, and C. A. Cotton. Review by A. E. F. 
Zone of Flow in the Earth’s Crust, An Experimental Contribution to 
the Question of the Depth of the. By Frank D. Adams 
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192 
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