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THE AMERICAN INDIAN
case of the former, we cannot be sure that this drill was not introduced by European colonists, and as archæological data from the Southwest give no trace of it, we may regard its
Hand Drilling
From a Mexican Codex
Strap Drill
Pumpdrill
Fig. 59. Methods of Drilling. Tylor
presence there as of Spanish origin. Again, the California drill is operated on a slightly different principle, and its very limited distribution suggests its intrusion. If these forms of the pumpdrill are truly independent inventions, they are evidently recent, for they would with time have spread over
