Note 87 — A. Implements made of Stone.

Spherical and oval stones with a peripheral groove are implements of a very simple form and hence they lend themselves to different uses. The old copper fac-simile of a stone hammer in the Museum of Science and Art in Philadelphia shows conclusively for the region in which it was found, viz., Lake Titicaca, Pako Island, in Bolivia, that similar stones were used as hammers.