Presidential Range of the White Mountains. 463 



ton. It is perhaps of even greater significance, however, 

 that Mount Ktaadn, like Mount Washington, stands at the 

 headwaters of three great river systems, the Penobscot, 

 Aroostook, and the St. John, — to which might fairly be added 

 also the Kennebec, since this river system which now heads in 

 Moosehead Lake, some distance southwest of Ktaadn, probably 

 drained the slopes of the mountain in pre-glacial times. The 

 occurrence of old upland topography in these two typically 

 remote spots among the drainage systems of New England (see 

 fig. 1) raises the question whether we ought not to expect 

 remnants of the New England upland to survive at the ex- 

 treme headwaters of these great rivers long after all traces of 

 that upland had vanished from the more dissected region 

 occupied by their larger branches and trunks. With this idea 

 in mind it will be interesting to see if similar scraps of graded 

 upland come to light in the Green Mountains and other remote 

 inland places. 



Dartmouth College, 

 Hanover, N. H. 



Am. Jour Sci.— Fourth Series, Vol. XXXVII, No. 221.— May, 1914. 

 32 



