136 TRANSACTIONS OF THE [maR. 19, 
March 12, 1888. 
No meeting held, on account of the severe storm. 
March 19, 1888. 
STATED MEETING. 
The President, Pror. J. 8. NEWBERRY, in the chair. 
Forty persons present. 
Some Indian stone-implements from Mansfield, Penn., sent by 
Mr. ANDREW SHERWOOD in illustration of his communication, 
read February 6th, 1888, were exhibited. These were flattened 
cobbles with small artificial depressions on the opposite flat sides. 
Mr. ArtHuR Ho.uick said these were examples of the pre- 
historic implements known among archeologists as ‘‘ hammer- 
stones;” and he showed similar worked cobbles which he had 
found in the shell-mounds of Staten Island. These were of 
sandstone, softer in material than those from Mansfield, and 
not as good in workmanship. He thought they were used for 
cracking oysters. 
The first ‘‘hammerstones” from Staten Island were found 
in February, 1884, and were described in the Proceedings of 
the Natural Science Association of Staten Island for May 10th, 
1884. Since that date he had found many in the same locality; 
and other places had also furnished them, for example, Keyport 
and Amboy, N. J., and Glen Cove, L. I. They are of different 
materials, including quartzite. Some are double-pitted on each 
side, some single-pitted, some only rough-pecked, while others 
are smooth or show only the natural inequality of the broad 
sides. But they all have battered edges, and to such a degree in 
some as to indicate harder usage than crushing mollusks. 
The specimens from Staten Island are mostly in the cabinet 
of the Natural Science Association of Staten Island. A number 
may be seen in the American Museum of Natural History. 
Figures are given in an article by Charles Rau, in the American 
Naturalist, Vol. VII., entitled ‘Indian Netsinkers and 
