50 



SCIENCE. 



[N. S. Vol. VII. No. 159. 



the part of the several speakers. The close 

 connection of the glacial lakes, the pre- 

 cursors of the present Great Lakes, with 

 the sands and clays was brought out ; the 

 presence of marine and fresh-water shells 

 and the evidence of differential uplift all 

 came up. The discussion was sustained by 

 Messrs. Scott, Taylor, Ami and Coleman. 



Topography and Glacial Deposits of the Mohaiok 

 Valley. Albert Peeey Beigham, Hamil- 

 ton, isr. Y. 



The present topography of the Mohawk 

 Valley was described and some probable 

 features of the ancient drainage stated. The 

 Mohawk was considered as a monoclinal 

 valley following the outcrop of the Utica 

 and Hudson River shales which had di- 

 verted the southern Adirondack drain- 

 age by headward cutting west to Little 

 Falls. Further evidence for the divide lo- 

 cated by Chamberlin at this point was 

 given in the valley tilling and arrange- 

 ment of streams to the westward. A pos- 

 sible discharge of the West Canada Creek 

 into the main valley west of Utica was sug- 

 gested. The Mohawk faults were reviewed 

 in their bearing on the maturing of the val- 

 ley. The westward movement of the lower 

 Mohawk Valley glacier was confirmed by 

 some additional evidence. The drift de- 

 posits fall into three groups, viz. : terraces 

 and deltas west of Utica ; terraces, kames 

 and other morainic masses between Utica 

 and Little Falls ; terraces of massive till 

 mantled by sands and clays, below Little 

 Falls. The drift of the valley was de- 

 scribed as representing lacustrine and fluvi- 

 atile phases of ice retreat, and some reasons 

 were given for a discharge prolonged and 

 strong, but not of great depth. 



The paper was illustrated by a good map 

 and was listened to with deep attention, as 

 so many of the fellows were familiar with 

 the region. The evidence of stream rob- 

 bing by the Mohawk in its upper portion 



and the diversion of the southwest Adiron- 

 dack drainage to the Hudson was striking. 



The paper was discussed by F. B. Tay- 

 lor. At its conclusion the Society ad- 

 journed until 8:30 p. m., at which time it 

 reconvened in the Physics lecture room of 

 the Universitj', to listen to the presidential 

 address of the retiring President, Professor 

 Edward Orton. The subject was ' Geolog- 

 ical Probabilities as to Petroleum ' and was 

 an able review of the hypotheses advanced 

 regarding oil and gas. The speaker was 

 happily introduced by Dr. George Dawson, 

 Director of the Canadian Geological Sur- 

 vey. 



On "Wednesday, at 10 a. m., the meetings 

 were resumed. Before the reading of 

 papers was begun the Committee on Photo- 

 graphs presented a report from its Chair- 

 man, Dr. George P. Merrill, of Wash- 

 ington. The report showed that 134 new 

 photographs had been received during the 

 year, bringing the number up to 1,558. 

 The Committee has also received a collec- 

 tion of 300 negatives taken by the Second 

 Geological Survey of Pennsylvania. An 

 exhibition of the pictures now in the pos- 

 session of the Society was made in an ad- 

 joining room, and it was evident that a 

 wealth of illustrative material for geolog- 

 ical instruction has been made available, 

 from sources, such as survey negatives, that 

 are not usually accessible. 



The Topography and History of Jamesville Lake, 

 N. Y. Edmund C. Quereau, Syracuse, 



]sr. Y. 



Jamesville Lake is one of a class of small 

 lakes in central New York which are often 

 called ' Kound Lakes,' a term which distin- 

 guishes them well from the ' Finger Lakes.' 

 It lies between two of the main valleys 

 (Onondaga and Butternut) which dissect in 

 this region the New York plateau in a gen- 

 eral south-north direction. The portion of 

 the plateau between these two valleys is dis- 



