Annual report of the Board of Regents of the Smithsonian Institution . Pig. 1.—Flint flake with one-sided marginal chipping that follows the rule, viz, donefrom the front toward the back, thus securing an edge every point of which is in thesame plane; (a) front, (b) back, (c) looking toward the edge. Professor Verworn made a tabulation to show the percentage ofspecimens that follow the rule and of those that do not. He chose. Y

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Keywords: ., bookauthorsmithsonianinstitutio, bookcentury1800, bookdecade1840