278 CURATOR’S ANNUAL REPORT. 
Great quantities of the shells of the common oyster 
are scattered over the point, but never, so far as I could 
find, below the upper part of the topmost layer. I have 
been able to find no other organic remains. 
When did this occur ? 
That the last emergence was very recent is evident be- 
cause the slopes are so little worn. 
The point itself must have been the northern part of 
the delta of the Croton river. 
By one of those unaccountable freaks, so often mani- 
fested by rivers flowing through alluvial soil, the lower 
half of the delta has been swept away. 
The curator of the museum, Prof. Dwight, read the 
following report : 
To the Scientific Section of Vassar Brothers In- 
stitute: Since the last report the following specimens 
have been added to the museum by purchase : 
Two specimens of Malachite and Azurite. 
One specimen of Limonite. 
One specimen of Galenite and Cerussite. 
One specimen of Willemite and Franklinite. 
One specimen of Sulphate of alumina. 
One specimen of Fluorite coated with Siverite. 
One specimen of Amazon stone. 
One specimen of Cuprite with Limonite. 
One specimen of Bornite with white quartz. 
One specimen of Bronzite. 
One specimen of Pyrolusite. 
One specimen of Apatite. 
One specimen of Fibrous Malachite. 
One specimen of Rhodcchrosite. 
One specimen of Arizonite. 
One specimen of Smoky quartz. 
One specimen of Cerussite. 
One specimen of Wavellite. 
One specimen of Native Antimony. 
One specimen of Chalcopyrite. 
One specimen of Cuprite. 
One specimen of Pyrargyrite. 
162 
