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POPULAR SCIENCE MONTHLY 



Fig. 2. Photograph op Model of Ithaca Sheet. (By William Stranahan.) 



Watkins Glen is but one of a great number — certainly many scores, 

 and probably hundreds — of picturesque gorges in southern central New 

 York, many of them unnamed, and the great majority known only to 

 a few. They lie in the southern half of the Finger Lake valleys, 

 notably Seneca and Cayuga (Fig. 1), cut in the slopes of the valleys 

 which enclose these lakes. Such an abundance of gorges and as- 

 sociated waterfalls, more than can be found in equal area in any other 

 part of eastern United States, is noteworthy, and seems to demand an 

 unusual explanation, which in fact is the case. This explanation has 

 been worked out step by step, being far more complex than at first 

 supposed, and involving the operation of geological agencies now no 



