Hitchcock.] 66 [December 20, 



ford, Crane Neck and Archelaus hills in West Newbury, Bear hill in 

 Methuen, Silver's, Golden, and Great hills in Haverhill, Bear and 

 Whittier's hills in Amesbury, and Powow hill in Salisbury; in New 

 Hampshire, Indian Ground and Chair hills in South Hampton, Morse 

 hill in East Kingston, Moulton Ridge, Martin, and Horse hills in 

 Kensington, Great hill at Hampton Falls, Bollins, Bunker, and 

 Stratham hills in Stratham, and Garrison hill in Dover; also, Nobby 

 lull in Mason, Campbell and Bellows hills in Greenville, and Jefts 

 hill in New Ipswich; in Maine, Frost and Bartlett hills in Elliot, and 

 Butler's and Great hills in South Berwick. Towns which are almost 

 wholly covered vvitn these hills are, in Massachusetts, North Andover, 

 Bradford, Groy eland, West Newbury, Haverhill and Amesbury ; and 

 in New Hampshire, South Hampton, Kensington and Stratham. 



In addition to these specially named, are numerous examples in 

 the towns of Medford, Maiden, Everett, Revere, Chelsea, Winthrop, 

 East Boston, Somerville, Cambridge, Watertown, Brighton, Newton, 

 and Brookline. There is a line of them from Revere through Win- 

 throp, Point Shirley, Deer Island, LovelFs, Gallop's and George's 

 Islands to Hull. Thej are no less conspicuous hrPlymouth County, 

 Cape Cod, the Elizabeth Islands, and very notably the whole length 

 of Long Island, N. Y. 



In attempting ±o .solve the origin of these hills, account should be 

 taken of their abundance over a long area near and parallel with the 

 coast, and also in certain localities far removed from the coast and 

 one thousand feet above the sea; in the former situation upon a level 

 country, and in the latter among high, irregular, ledgy hills. Adjoin- 

 ing these areas of abundant lenticular hills, are sections almost 

 wholly destitute of any glacial drift, e.g., Salem, while over the 

 greater portion of our territory it occurs in irregular accumulations 

 of limited extent, and not at all in these steep, smoothly rounded 

 hills. There must be some significance in their prevailing N. W..— 

 S. E. trend, and also in their occasional arrangement in a N. and S. 

 series and west of south; and these seem probably to be due to the 

 direction of motion of the great ice-sheet, which was approximately 

 the same, in the same regions. In the lowlands of Scotland the till 

 is described by Geikie as lying sometimes in lenticular masses, re- 

 sembling the hills which we find in New England, but apparently 

 less prominent. A more common contour of the Scottish till, in 

 which it differs from our own, is in prolonged ridges, called " drums" 

 m "sowbacks," extending in the same direction with the flow .of -the 



