C. R. Van Hise—Hornblendes and Augites. 385 
general the moraine contains a much larger proportion of clay 
and fine material than the terminal moraines of the Andros- 
coggin glacier, a fact which favors the theory that it was formed 
in the water where the ice confronted the ocean. There are 
hills to the south of the moraine high enough to have formed 
islands in Champlain time. If the ice met the sea at the place 
of the terminal moraine, both the ice and moraine would be par- 
tially protected by these supposed islands from the force of the 
Atlantic waves. If the moraine was deposited before the water 
rose, then it would twice be under the surf during the rising 
and falling of the sea. If so, then the protection of the islands 
must have been very perfect, for there are few signs of marine 
wash on the moraine. It seems more likely that the sharpness 
of outline of the ridge is due to the fact that it was deposited 
under the sea, and only once has been under the action of the 
surf, Other considerations might be stated which favor the 
hypothesis that the moraine was formed at a time when the sea 
stood at a much higher level than now, but discussion of the 
subject is postponed until after further study in the field. On 
the whole, I consider it probable, but not certain, that the ice 
here flowed intosthe sea at the time the moraine was being 
formed. 
Several lines of high hills cross the state of Maine from 8. 
W. to N.E., transverse to the line of glaciation. The low cols 
in these hill-systems often served for the passage of the kame 
_and osar rivers, and they are also often bordered by many irreg- 
ular masses of till. These are not steep, transverse ridges like 
those above described, but are somewhat gently sloped heaps of 
various shapes and they lie in various directions. As the inter- 
pretation is doubtful, no detailed account of them is here given. 
Colorado Springs, December, 1886. 
Art. XL.—WNote on the enlurgement of Hornblendes and Augites 
in Hragmental and Hruptive Rocks ; by C. R. Van Hise. 
(Published by permission of the Director of the Geological Survey.) 
In the number of this Journal for September, 1885, I 
described the enlargement of hornblende fragments in certain 
conglomerates of northeastern Minnesota, showing that grains 
of hornblende, after deposition in a sedimentary rock, may, 
under favorable conditions, continue their growths. The 
chief object of the paper was to show that enlargements of this 
sort may help to produce in fragmental rocks the condition 
ordinarily known as metamorphic. Entirely similar enlarge- 
ments of hornblende, but in massive eruptive rocks, are described 
