DRUM LI NS. 



283 



to an elliptical convex lens, Professor 

 Hitchcock has called them lenticular 

 Mils, to distinguish these deposits of 

 till from the broadly flattened or undu- 

 lating sheets which are common through- 

 out New England. 



The trend, or direction of the longer 

 axis, of these lenticular hills is nearly 

 the same for all of them comprised 

 within any limited area, and is approx- 

 imately like the course of the striae or 

 glacial furrows marked upon the neigh- 

 boring ledges. In eastern Massachu- 

 setts and New Hampshire, within twen- 

 ty-five miles of the coast, it is quite 

 uniformly to the southeast, or east- 

 southeast. Farther inland, in both of 

 these States, it is generally from north 

 to south, or a few degrees east of south ; 

 while in the valley of the Connecticut 

 River it is frequently a little to the 

 west of south. In New Hampshire, 

 besides its accumulation in these hills, 

 the till is frequently amassed in slopes 

 of similar lenticular form. These have 

 their position almost invariably upon 

 either the south or north side of the 

 ledgy hills against which they rest, 

 showing a considerable deflection toward 

 the southeast and northwest in the east 

 part of the State. It can not be doubted 

 that the trend of the lenticular hills, 

 and the direction taken by these slopes, 

 have been determined by the glacial 

 current, which produced the striae with 

 which they are parallel.* 



* " Proceedings of the Boston Society of Nat- 

 ural History," vol. xx, pp. 224, 225. 



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