z “With the oe Collaboration Ole 
ALBERT JOHANNSEN, Petrology 
“ASSOCIATE EDITORS 
& a : RICHARD A. F. PENROSE, Jr., Philadelphia, Pa. 
: 3 _ WILLIAM H. HOBBS, University of Michigan 
FRANK D. ADAMS, McGill University 
CHARLES K. LEITH, University oi.Wisconsin 
; “WALLACE W. ATWOOD, Clark University 
euro race University * WILLIAM H. EMMONS, University of Minnesota 
Smithsonian Institution ARTHUR L. DAY, Carnegie Institution i 
So RE WE ee dee gee =p Nhe 
CHEMISTRY OE THE CRYSTALLIZATION AND MAGMATIC 
0] K FAULT OF SOUTHWEST VIRGINIA - - - CHESTER K. WENTWORTH 
THE CYCLE OF GLACIATION - -  -  Wrtttam HERsert Hopes 
"CHICAGO, ‘ILLINOIS, U.S. A. 
HE CAMBRIDGE UNIVERSITY PRESS, LonDoN 
BUSHIKL-KAISHA, Tokyo, OSAKA, Kyoto, FUKUOKA SENDAI 
| ‘THE MISSION. BOOK COMPANY, SHANGHAI 
" oe 3 
ROLLIN T. CHAMBERLIN , Dynamic Geology — 
TATION OF IGNEOUS ROCKS - x = oe - = <> J. BE. Veer; 
“NUMBER 4 
IKIE, Great Britain i Ba yee JOHN C. BRANNER, Leland Stanford Junior University 
295 
