FOSSIL IMPRESSIONS. — II. 
Since writing the preceding article, I have been able 
to obtain, through the kindness of President Hitch- 
cock, a number of additional specimens of fossil 
impressions. By the aid of these, I may hope to give 
an idea of the system of impressions, so far as it has 
been discovered, without, however, attempting to enter 
into minute details. For these, I would refer to the 
account of the “ Geology of Massachusetts,” by Presi- 
dent Hitchcock ; to his valuable article published in 
the “ Memoirs of the American Academy ;” and to his 
geological works generally. 
The numerous tracks which have been assembled 
together in the neighborhood of Connecticut River 
have afforded an opportunity of prosecuting these 
studies to an extent unusual in the primitive rocky 
soil of New England. ‘These appearances are not, 
indeed, wholly new. Such traces had been previously 
