_ VOLUME XX1 NUMBER 2 
3 | THE 
JOURNAL or GEOLOGY 
“ . A SEMI-QUARTERLY 
he a EDITED BY 
My THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the Active Collaboration of 
i SAMUEL W. WILLISTON nny ALBERT JOHANNSEN WILLIAM H. EMMONS 
; Vertebrate Paleontology Petrology Economic Geology 
_ STUART WELLER WALLACE W. ATWOOD ROLLIN T. CHAMBERLIN 
! Invertebrate Paleontology Physiography Dynamic Geology 
ASSOCIATE EDITORS 
SIR ARCHIBALD GEIKIE, Great Britain GROVE K. GILBERT, Washington, D.C. 
HEINRICH ROSENBUSCH, Germany CHARLES D. WALCOTT, Smithsonian Institution 
THEODOR N. TSCHERNYSCHEW, Russia HENRY S. WILLIAMS, Cornell University 
‘CHARLES BARROIS, France JOSEPH P.IDDINGS, Washington, D.C. 
_ ALBRECHT PENCK, Germany JOHN C. BRANNER, Leland Stanford Junior Wuiversiey 
_ HANS REUSCH, Norway ’ RICHARD A. F. PENROSE, Jr., Philadelphia, Pa, 
- GERARD Ds&GEER, Sweden WILLIAM B. CLARK, Johns Hopkins University 
ORVILLE A. DERBY, Brazil WILLIAM H. HOBBS, University of Michigan 
T. W. EDGEWORTH DAVID, Australia FRANK D. ADAMS, McGill University 
- BAILEY WILLIS, Argentine Republic CHARLES K, LEITH, University of Wisconsin 
; FEBRUARY-MARCH 10913 
§ 
_ THE RELATIVE SOLUBILITIES OF THE CHEMICAL CONSTITUENTS OF ROCKS 
4 C. H. SMytH, Jr. 105 
_ THE COBALT SERIES; ITS CHARACTER AND ORIGIN - -  Mortey E. Wrson 121 
THE LATER CENOZOIC HISTORY OF THE WIND RIVER MOUNTAINS, WYOMING 
ss Lewis G. WESTGATE AND E. B. BRANSON 142 
4 VARIATIONS OF CERTAIN ADIRONDACK BASIC INTRUSIVES Wittitam J. MitteR 160 
: “THE ORDER OF CRYSTALLIZATION IN IGNEOUS ROCKS” - -  Vicror ZIEGLER 18r 
4 _ANGISTORHINUS, A NEW GENUS OF PHYTOSAURIA FROM THE TRIAS OF 
WYOMING - - - = = = = - - - - Maurice G. Ment 186 
SRO et See pe 8) a eB CS Sua ah phase mtn Seti 2 le 
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a Pte “NIV ERS ELEY ORsCHICAGO PRESS 
Me CHICAGO, ILLINOIS, U.S.A. 
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b AGENTS ; 
i THE CAMBRIDGE UNIVERSITY PRESS, Lonpon anp EDINBURGH 
b WILLIAM WESLEY & SON, Lonpon 
+, TH. STAUFFER, Lerrzic 
ra : THE MARUZEN-KABUSHIKI-KAISHA, Toxvo, Osaka, Kyoto 
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