126 The Ottawa Naturalist. 



in question. We look forward with interest to Mr. Taylor's 

 paper which is to follow this one in which an account of the 

 submergence phenomena at lower levels in the Mattawa and 

 Ottawa River Valleys will be given. 



Upham, Warren, ■' Origin and Age of the Laurentian Lakes." 

 Amer. GeoL, Vol, XVIII, No. 3, pp. 169-177, Sept., 1896. 



In this paper the author discusses the pre-glacial condition 

 of the St. Lawrence basin, the changes which brought in the ice 

 age and the subsequent recession of the ice-sheet. The glacial 

 lakes in the St. Lawrence basin are then described : Lakes 

 Warren, Algonquin and Iroquois. Niagara River and its his- 

 tory, as well as that of the gorge below the falls, are given, 

 whilst the hypothesis of the Nipissing and Mattawa outlets 

 from Lakes Hnron, Michigan and Superior is followed by a 

 computation of the probable duration of Niagara Falls and the 

 past glacial period. 



The Algonquin and Nipls.sing Beaches. 



Students of pleistocene geology will do well to read the 

 correspondence by Messrs. F. B. Taylor and Warren Upham on 

 the above subject in the June number of the Artierican Geologist. 

 In a terse and taking manner the two writers present the 

 evidence on which they pin their faith. Until the topography 

 of the higher abandoned strands of the modern great lakes are 

 better known and the relative heights of the various orographic 

 features adjacent are ascertained it seems premature to dogmatise. 

 It seems to us that natural the and commendable method of 

 reaching more satisfactory and definite conclusion would be to 

 begin with the present level of the lakes and proceed in 

 delineating all the abandoned shore lines now visible all around 

 these lakes, map them out ; then, begin to draw inferences. 



