The Charles River in Massachusetts.—Clap p. 233 
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PP. 554-600. 
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Soc. Nat. Hist., Vol. 17, pp. 486-488. 
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pointed to Consider a General System of Drainage for the Valleys 
of the Mystic, Blackstone and Charles Rivers, Mass. (1886). 
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politan Water Supply, 1895, House Document No. 500 
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' sis, M. I. T. Library. 
Powe t, J. W.—Exploration of the Colorado River of the West. 
_ Russett, I. C_—Rivers of North America. 
SHater, N. S., and others.—Geology of the Narrangansett Basin, Mon- 
ograph 33, U. S Geological Survey. 
Triton, J. L— Geology of the Southwest Portion of the Boston Basin, 
Proc. Bos. Soc. Nat Fist., Vol 26, pp. 500 et seq. 
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1895, Vol. 3, pp. 72-74. 
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United States, in Tenth Census Report. 
Reports OF THE JoINT Boarp of the Metropolitan Park Commission and 
the Massachusetts State Board of Health, on the Improvement of 
the Charles River, 1804 and 1896. 
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GEOLOGICAL HISTORY OF THE HEMATITE IRON 
ORES OF THE ANTWERP AND FOWLER 
BELT IN NEW YORK. 
By W. O. CrospBy, Boston. 
The occurrence in specimens of the massive red hematite 
from the old Sterling iron mine near Antwerp, in Jefferson 
county, New York, of more or less pyrite and possibly pyrrho- 
tite, in addition to the well known pockets lined with crystal- 
lized siderite, chalcodite, specular hematite and quartz and 
further adorned by the brilliant golden needles of millerite for 
which this mine is famous, long ago suggested to me, as, per- 
haps, to others, that the hematite had had its origin in the 
differential oxidation of slightly nickeliferous iron sulphides, 
the nickel having remained in combination with the sulphur and 
recrystalized as millerite. But when in the summer of 1895 I 
