GLACIAL DRIFT IN NEW ENGLAND. 447 



tention at once to certain points of resem- 

 blance between the phenomena there and 

 those which I had seen in the neighborhood 

 of Boston. Since then, we have made sev- 

 eral excursions together, have visited Niag- 

 ara, and, in short, have tried to collect all 

 the special facts of glacial phenomena in 

 America. . . . You are, no doubt, aware that 

 the whole rocky surface of the ground here 

 is polished. I do not think that anywhere in 

 the world there exist polished and rounded 

 rocks in better preservation or on a larger 

 scale. Here, as elsewhere, erratic debris are 

 scattered over these surfaces, scratched peb- 

 bles impacted in mud, forming unstratified 

 masses mixed with and covered by large er- 

 ratic boulders, more or less furrowed or 

 scratched, the upper ones being usually an- 

 gular and without marks. The absence of 

 moraines, properly so-called, in a country so 

 little broken, is not surprising ; I have, how-' 

 ever, seen very distinct ones in some valleys 

 of the White Mountains and in Vermont. 

 Up to this time there had been nothing very 

 new in the aspect of the phenomena as a 

 whole ; but on examining attentively the in- 

 ternal arrangement of all these materials, es- 

 pecially in the neighborhood of the sea, one 



