THE 
A SEMI-QUARTERLY 
EDITED BY 
THOMAS C. CHAMBERLIN AND ROLLIN D. SALISBURY 
With the Active Collaboration of 
SAMUEL W. WILLISTON 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 
“ 
/OLUME XXI NUMBER 7 
OURNAL or GEOLOGY 
‘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 University 
‘HANS REUSCH, Norway RICHARD A, F. PENROSE, Jr., Philadelphia, Pa. 
GERARD DEGEER, Sweden WILLIAM B. CLARK, Johns Hopkins University 
ORVILLE A. DERBY, Brazil WILLIAM H. HOBBS, University of Michigan 
er. W. EDGEWORTH DAVID, Australia FRANK D. ADAMS, McGill University 
BAILEY WILLIS, Argentine Republic CHARLES K, LEITH, University of Wisconsin 
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= 
4 
4 OCTOBER-NOVEMBER 1913 
ae OE HISM AND THE FORMATIVE PROCESSES. III. - - T. C. CHAMBERLIN 577 
THE GENERAL PRINCIPLES UNDERLYING METAMORPHIC PROCESSES 
JoHN JOHNSTON AND PAUL NIGGII 
4 
‘THE PRIMITIVE STRUCTURE OF THE MANDIBLE IN AMPHIBIANS AND REPTILES 
f S. W. WILLISTON 
‘FOSSIL FEATHERS AND SOME HERETOFORE UNDESCRIBED FOSSIL BIRDS 
R. W. SHUFELDT 
: ‘THE VOLCANOES AND ROCKS OF PANTELLERIA - - - HENRY S. WASHINGTON 
LOG OF WELL OF PENNSYLVANIA SALT COMPANY, DETROIT, MICH. 
fy Wittram H. Fry 
VIEWS - - - - - - - - = ra =) ys ez Z a a3 5 
THE UNIVERSEEY OF -CHICAGO“UVPRRESS 
CHICAGO, ILLINOIS, U.S.A. 
AGENTS 
THE CAMBRIDGE UNIVERSITY PRESS, Lonpon anp EDINBURGH 
WILLIAM WESLEY & SON, Lonpon 
KARL W. HIERSEMANN, LEirpzic 
THE MARUZEN-KABUSHIKI-KAISHA, Toxyo, Osaka, Kyoto 
671 
672 
