TITLES OF PAPERS 25 



After this 



CHANGES PRODUCED ON SPRINGS BY A SINKING WATER TABLE 

 BY T. C. HOPKINS 



was given without notes; 10 minutes. 

 There was then read a paper entitled 



CRITERIA FOR THE RECOGNITION OF VARIOUS TYPES OF SAND GRAINS 



BY W. H. SHEEZER 



The reading was followed by the presentation of illustrative lantern 

 ■slides; 20 minutes. The discussion that followed was participated in by 

 Joseph Barrell, A. C. Lane, and W. M. Davis. 



The next paper 



CLIMATE AND PHYSICAL CONDITIONS OF THE KEEWATIN 

 BY A. P. COLEMAN 



was presented without notes, in 20 minutes, and was discussed by W. G. 

 Miller, H. F. Eeid, W. M. Davis, and the author. 



With permission from the Society, an overture from the American 

 Philosophical Society was then read, asking for encouragement of a plan 

 for American exploration in the Antarctic regions. 



On motion, the communication was referred to the Council for consid- 

 eration and report back to the Society. 



Then was presented from notes 



THEORY OF ISOSTACY 

 BY W. M. DAVIS 



in 15' minutes. The paper was discussed by H. F. Reid. 

 The last paper of the afternoon was 



MECHANICS OF FAULTS 

 BY HARRY FIELDING REID 



Presented extemporaneously; 20 minutes. 

 The section adjourned at 5 o^clock. 



The section of glacial and physiographic geology began the afternoon 

 session with H. L. Fairchild in the chair and F. B. Taylor acting as 

 secretary. 



