1893.] Shell Heaps of Florida. 117 
absence of human implements we should hardly feel jus- 
tified in saying that it was made by man; though in its 
general features it resembles his work. ” At the base of this 
bluff the writer picked up a chisel of shell, and, what is more 
conclusive (since objects not in place prove but little) a clearly 
defined fire-place was discovered at a depth of four feet from 
the surface. It is perfectly safe to say that no fresh-water 
shell heap can be found on the St. John’s River where a care- 
ful search would not reveal unmistakable evidences of human 
agency in its origin. 
