344 
Art, XXXVI.—On the History of Eozoin Canadense. 
WITH A PLATE. 
states that in these organic remains the calcareous skeleton re- 
mains unchanged, while the sarcode is replaced by certain sili- 
February, 1865. 
scribes the general geological relations of the 
and is accompanied by two sections which we 
reproduce below, ee : a 
He also relates the history of the first discovery of the fossil, — 
cimens of which were exhibited by him to the American 
ation, at Springfield in August, 1859—and were then r 
U 
