GLACIAL PHENOMENA IN MAINE. 139 
the back of the knoll, while on either side they 
fall away slightly to the right and left, con¬ 
verging again to meet and continue their 
straight course over the lower slope; showing 
that, though such knolls, entirely buried be¬ 
neath the mass of the ice, are no obstacle to 
its advance, the inequalities of the bottom do 
affect in a slight degree the direction of the 
movement, and render the striae less even than 
over a level surface. Of course, where the ice 
is very thick, bottom inequalities will make 
little impression upon the onward movement 
of the whole mass ; but in proportion as the 
ice w'anes, it adapts itself to the depressions 
and knolls of the surface, in consequence of 
which the glacial marks lose the uniformity 
of their trend. 
The morning following my arrival at Bar 
Harbor I spent in examining the glacial phe¬ 
nomena in its immediate neighborhood. At 
Bar Harbor itself, the marks bear north and 
north-northwest. A mile farther south they 
are all in a north-northwesterly direction. 
The cove of the Spouting-Horn, however,— 
a deep recess in the rock, where the surf acts 
with wonderful force, — is engraved on both 
