134 GLACIAL PHENOMENA IN MAINE. 
appear under the arm of the sea which sepa¬ 
rates' Mount Desert from the coast. They 
reappear on the north shore of the island 
itself, passing over its higher summits to lose 
themselves finally under the level of the ocean. 
Not only are the characteristic marks to be 
followed along the entire length of the road, 
but the whole surface of the country is mou- 
tonnee; namely, worn into those rounded, 
knoll-like surfaces so frequently alluded to in 
this and previous chapters, and so well known 
in Switzerland as due to glacial action. Bald 
Mountain is a striking example of this kind of 
hill. 
This region is literally strewn with huge 
boulders, sometimes forty or fifty feet high. 
For the most part they seem to belong to the 
neighboring hills, and have not travelled a 
great distance. There are many of these boul¬ 
ders, however, which add their testimony to 
show that the path of the great ice-plough has 
been from north to south. This is especially 
the case with the granite rock of Dedham, so 
well characterized by its large feldspar crys¬ 
tals, detached masses of which are frequently 
found to the south of that locality, but never 
