VOLUME XIX 



NUMBER 1 



THE 



Journal of Geology 



A Semi-Quarterly 



Edited By 



THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 

 With the Active Collaboration of 



SAMUEL W. WILLISTON 



Vertebrate Paleontology 



STUART WELLER 



Invertebrate Paleontology 



ALBERT JOHANNSEN 

 Petrology 



WALTER W. ATWOOD 

 Physiography 



WILLIAM H. EMMONS 



Economic Geology 



ROLLIN T. CHAMBERLIN 

 Dynamic Geology 



ASSOCIATE EDITORS 



SIR ARCHIBALD GEIKIE, Great Britain 

 HEINRICH ROSENBUSCH, Germany 

 THEODOR N. TSCHERNYSCHEW, Russia 

 CHARLES BARROIS, France 

 ALBRECHT PENCK, Germany 

 HANS REUSCH, Norway 

 GERARD DeGEER, Sweden 

 ORVILLE A. DERBY, Brazil 

 T. W. E. DAVID, Australia 

 BAILEY WILLIS, Argentine Republic 



GROVE K. GILBERT, National Survey, Washington, D.C. 



CHARLES D. WALCOTT, Smithsonian Institution 



HENRY S. WILLIAMS, Cornel] University 



JOSEPH P. IDDINGS, Washington, D.C. 



JOHN C. BRANNER, Stanford University 



R. A. F. PENROSE, Philadelphia, Pa. 



WILLIAM B. CLARK, Johns Hopkins University 



WILLIAM H. HOBBS, University of Michigan 



FRANK D. ADAMS, McGill University 



CHARLES K. LEITH, University of Wisconsin 



JANUARY-FEBRUARY, 191 1 



CONTENTS 



CLIMATE AND PHYSICAL CONDITIONS OF THE KEEWATIN - - - A. P. Coleman i 



THE AGENCY OF MANGANESE IN THE SUPERFICIAL ALTERATION AND SECOND- 

 ARY ENRICHMENT OF GOLD DEPOSITS ------- William H. Emmons 15 



LOCAL DECOMPOSITION OF ROCK BY THE CORROSIVE ACTION OF PRE-GLACIAL 



PEAT-BOGS ---------- -Edwin W. Humphreys and Alexis A. Julien 47 



ON THE FOCUS OF POSTGLACIAL UPLIFT NORTH OF THE GREAT LAKES 



J. W. Spencer 57 



A GEOLOGICAL ROUTE THROUGH CENTRAL ASIA MINOR William T. M. Forbes 61 



THE VARIATIONS OF GLACIERS. XV -------- - Harry Fielding Reid 83 



REVIEWS ---'-----------------------.-_ 90 



C^e dnitoergity of Chicago $re&3 



CHICAGO, ILLINOIS 



CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



WILLIAM WESLEY & SON, London 



TH. STAUFFER, Leipzig 



