DRAINAGE SYSTEMS AND THE GLACIAL PERIOD. 207 



direct exploration has not been made to confirm these 

 theoretical conclusions. In the opinion of Mr. Carll, 

 Chautauqua Lake did not flow directly to the north, but, 

 passing through a channel nearly coincident with that 

 now occupied by it, joined the northerly flowing stream 

 a few miles northeast from Jamestown.* It is probable, 

 however, that Chautauqua did not then exist as a lake, 

 since the length of preglacial time would have permitted 

 its outlet to wear a continuous channel of great depth cor- 

 responding to that known to have existed in the Cone- 

 wango and upper Alleghany. 



The foregoing are but a few of the innumerable in- 

 stances where the local lines of drainage have been dis- 

 turbed, and even permanently changed, by the glacial de- 

 posits. Almost every lake in the glaciated region is a 

 witness to this disturbance of the established lines of 

 drainage by glacial action, while in numerous places where 

 lakes do not now exist they have been so recently drained 

 that their shore-lines are readily discernible. 



An interesting instance of the recent disappearance of 

 one of these glacial lakes is that of Eunaway Pond, in 

 northern Vermont. In the early part of the century the 

 Lamoille River had its source in a small lake in Crafts- 

 bury, Orleans County. The sources of the Missisquoi 

 River were upon the same level just to the north, and the 

 owner of a mill privilege upon this latter stream, desiring 

 to increase his power by obtaining access to the water of 

 the lake, began digging a ditch to turn it into the Mis- 

 sisquoi, but no sooner had he loosened the thin rim of 

 compact material which formed the bottom and the sides 

 of the inclosure, than the water began to rush out through 

 the underlying and adjacent quicksands. This almost in- 

 stantly enlarged the channel, and drained the whole body 

 of water oft 3 in an incredibly short time. As a consequence, 



* Second Geological Survey of Pennsylvania, vol. iii. 

 15 



