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14 Scientific Intelligence. 
residual and much diminished portion, the natural contraction of 
which would cause corrugations of the superincumbent stratified 
mass, such as are everywhere seen in these ancient rocks. 
The source of voleanic rocks is partly in this lower and more or 
less exhausted stratum of comparatively insoluble and_basie 
ferriferous silicates, whence come melaphyres and_ basalts ;— 
e 
trachytic rocks ;—and partly, also, it is conceived, in later aque- 
ous deposits of superficial origin, which, also, may be brought 
within the influence of the central heat. 
This attempt to explain the genesis of crystalline rocks by the 
continued solvent action of subterranean waters on a primitive 
stratum of igneous origin, the author designates the erenitic hypo- 
thesis, from the Greek, xp7vn, a spring or fountain. A prelim- 
inary statement of it was made by him to the National Academ 
of Sciences at Washington, April 15, 1884, and appears in the 
American Naturalist for June. : 
2. Alaska glacier phenomena.—Mr. Thomas Meehan, after an 
examination of portions of Alaska glaciers, states (Proceedings 
Acad. Nat. Sci. Philad., 1883, 249) that beneath the Muir glacier, 
which had been described as 400 miles long, the subglacia 
8 
estimate, 100 feet wide and 4 feet in average depth; and that he 
learned from others that the flow was the same winter and summer. 
New Brunswick y by G. J. Marrurw (Trans. Roy. Soc. Canada, 
- 1882).—Treats of the remains of Paradoxides, and especially of the 
successive forms dependent on age of individuals in the species, 
. deminicus and P. Acadieus, here described by the author. 
ue wae Phosphate, or apatite, of the Canadian rocks.— 
oa 
o they lie in veins ainin 
i 4 > cont g be 
_ pyroxene, hornblende, and feldspar, with calcite, the apatite, and 
