J. C. Smock—Thickness of the Continental Glacier. 339 
mainly of manganese, with a large amount of lime, anda small 
amount of iron. The examination was made by Mr. Dunning- 
ton who ascertained with certainty the absence of columbic 
acid. Possibly this mineral may be allied to Nordenskjéld’s 
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ence of fluocerite. 
One or two additional minerals from this locality remain to 
be more fully examined, and they will probably prove to be of 
Interest, 
University of Virginia, Jan. 27, 1883. 
Arr. XXXIV.—On the Surface Limit or Thickness of the Con- 
tinental Glacier in New Jersey and adjacent States; by J. C. 
MOCK, New Brunswick, N. J. 
[Read at the Montreal meeting of the American Association for the 
Advancement of Science. 
whole question. The results of field wor in sictgciey 2 by 
State. The existence of such a moraine an 
to the glacial drift in New Jersey was suggested to the nse ee 
in 1876, by Professor George H. Cook, State Geologist. Vu 
