VOLUME XXIV 



THE 



NUMBER 4 



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 ALBERT JOHANNSEN, Petrology 



STUART WELLER, Invertebrate Paleontology ROLLIN T. CHAMBERLIN, Dynamic Geology 



ALBERT D. BROKAW, Economic Geology : 



ASSOCIATE 

 SIR ARCHIBALD GEIKIE, Great Britain 

 CHARLES BARROIS, France 

 ALBRECHT PENCK, Germany 

 HANS REUSCH, Norway 

 GERARD DeGEER, Sweden 

 T. W. EDGEWORTH DAVID, Australia 

 BAILEY WILLIS, Leland Stanford Junior University 

 GROVE K. GILBERT, Washington, D.C. 

 CHARLES D. WALCOTT, Smithsonian Institution 

 HENRY S.WILLIAMS, Cornell University 



EDITORS 



JOSEPH P.IDDINGS, Washington, D.C. 



JOHN C. BRANNER, Leland Stanford Junior University 



RICHARD A. F. PENROSE, Jr., 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 



WALLACE W. ATWOOD, Harvard University 



WILLIAM H. EMMONS, University of Minnesota 



ARTHUR L. DAY, Carnegie Institution 



MAY-JUNE 1916 



NOTE ON THE LINEAR FORCE OF GROWING CRYSTALS 



George F. Becker and Arthur L. Day 313 



THE CLASSIFICATION OF THE NIAGARAN FORMATIONS OF WESTERN OHIO 



Charles S. Prosser 334 



ORIGIN OF THE LYMAN SCHISTS OF NEW HAMPSHIRE - Frederic H. Lahee 366 



NOTES ON THE DISINTEGRATION OF GRANITE IN EGYPT - Donald C. Barton 382 



A RECORDING MICROMETER FOR GEOMETRICAL ROCK ANALYSIS S. J. Shand 394 



REVIEWS 



RECENT PUBLICATIONS 



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THE UNIVERSITY OF CHICAGO 



CHICAGO, ILLINOIS, U.S.A. 



PRESS 



Agents 



THE CAMBRIDGE UNIVERSITY PRESS, London and Edinburgh 



KARL W. HIERSEMANN, Leipzig 



THE MARUZEN-KABUSHIKI-KAISHA, Tokyo, Osaka, Kyoto 



THE MISSION BOOK COMPANY, Shanghai 



