Page:Smithsonian Report (1909).djvu/641

Rh In that case the chipping is done from the back toward the front, as one might expect; a fact which strengthens the theory that the chip- ping is intentional and not accidental.

Professor Verworn made a tabulation to show the percentage of specimens that follow the rule and of those that do not. He chose two series universally recognized as artifacts, comparing them with each other, and later with a series of eoliths from Puy-de-Boudieu (Cantal). His results follow: