TITLES OF PAPERS. 379 



The next paper, illustrated with lantern views, was entitled — 



HOMOLOGY OF JOINTS AND ARTIFICIAL FRACTURES 

 BY J. B. WOODWORTH 



A brief abstract is published in the Journal of Geology, volume v, 

 January-February, 1897, pages 97, 98. 



The following paper was also illustrated by lantern views : 



PHYSIOGRAPHIC DEVELOPMENT OF THE DISTRICT OF COLUMBIA REGION 



BY N. H. DARTON 



The next paper, by the same author, was entitled — 



DIKES IN APPALACHIAN VIRGINIA 

 BY N. H. DARTON 



Remarks were made by J. J. Stevenson. 

 The following paper was then read : 



ON THE CHANGES OF DRAINAGE IN THE OHIO RIVER BASIN 



BY FRANK LEVERETT 



The paper was discussed by the President, G. F. Wright, M. R. Camp- 

 bell, Edward Orton, N. S. Shaler, I. C. White, H. P. Gushing, and the 

 author. 



An abstract of this paper is published in Science, vol. v, January 15, 

 1897, page 85. 



Mr S. F. Emmons made some announcements, and the Society ad- 

 journed until the evening session. 



Session of Tuesday Evening, December 29 



The evening session was held in the lecture hall of Columbian Univer- 

 sity for the presentation of the Presidential address. Mr G. K. Gilbert 

 introduced President Le Conte, who delivered his address, entitled — 



EARTH-CRUST MOVEMENTS AND THEIR CAUSES 

 BY THE PRESIDENT, JOSEPH LE CONTE 



It is printed as pages 113-126 of this volume. 



