Geology and Mineralogy. 395 
II. GEoLoGy AND MINERALOGY. 
1, Note on specimen of Metadiabase from Connecticut Lake, 
collected and sliced by G. ves.—The fragments, appar- 
game. On the whole, though these objects are unlike any purely 
tineral substance with which I am acquainted, and are probably 
gments of some organic body, I do not think it possible at 
Present to indicate with any certainty their probable affinities. 
Sept. 7, 1876, : J. W. D : 
Ke On Streams of Water beneath Glaciers. — Mr. Cuarves 
‘SuT, in the Philosophical Magazine for June, states that, 
*cording to Professor Wm. Thomson’s experiments, the freezing 
