INDEX TO VOLUME XXI 
Paige, Sidney. The Bearing of Progressive Increase of Viscosity during 
Intrusion on the Form of Laccoliths : 
Paleozoic Sediments, Notes on the Origin of Certain, Uineeared by. fe 
Cambrian and Ordovician Rocks of Center County, Pennsylvania. 
By Thomas C. Brown 
Pantelleria, The Volcanoes and Rocks op By Henry S. Washington 6 53, 
Pennsylvania Salt Company, Detroit, Michigan, Log of Well of. By 
William H. Fry ; ; 
Petrology of Sedimentary Rockes A Study in ies By G. Sherburne 
Rogers 
Pre-Cambrian pereiecaphy of ihe ale SuperomLake Huron Regent 
The Significance of Recent Developments in the. By Morley E. 
Wilson. : 
Preliminary Notes on cae Tencoue Ross) of jens By S. Kozu 
Principles Underlying Metamorphic Processes, The General. By John 
Johnston and Paul Niggli : ; : : : 
Prindle, L. M., and Alfred H. Brooks. The Mount McKinley Region. 
Review iy BacAs:S: 
Progressive Increase of Wiscomen The earns oe ducing feverasint on 
the Form of Laccoliths. By Sidney Paige 
Prosser, Charles S. The Huron and Cleveland Shales of Nonthera Ohio 
Pseudobrecciation in Ordovician Limestones in Manitoba. By R. C. 
Wallace 
Quizzyhota Laccolite, The. By E. H. L. Schwarz . 
Recent Publications 5 «+ + 3797 469; 
Reconnaissance in the Speier Wasatch Misantaias: Utah= By G28 
Loughlin 
Reid, Harry Fielding. Werrions of Chase XVII 
Variations of Glaciers. XVIII ; 
Relative Solubilities of the Chemical Constituents of Rocks: The. By 
C. i. ae pee 
Reviews . : : ) 005,102, 2845.370, 405, 508,072; 
Rock Classification on sete Co. ordinates. By Alexander N. Winchell 
Rogers, Austin F. Observations of the Feldspars 
Rogers, G. Sherburne. A Study in the Petrology of Sedimentary Rocke, 
Overthrust Fault in Nearly Flat Strata - - - - - 
Schaller, Waldemar T. Mineralogical Notes, Series 1 and 2. Review 
byes Be. .. 
Schwarz, EJ H. L. The lauoryiot ieaceolite 
Secondary Enrichment of Silver Ores, The. By H. C. Chee 
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