1879. ] Made their Implements. 671 
of a spearhead, and it could be put to use, for this purpose, with 
but slight alteration. The thickness of the flake to be split off 
depends upon the nearness or distance from the edge of the 
obsidian on which the straight edge of the split deer horn is held 
at the time the blow is struck. 
The flake having been obtained, I watched with much interest 
and attention the process of working it into an arrowhead. 
He now squatted on the ground, sitting on his left foot, his 
right leg extended in a position often assumed by tailors at work, 
He then placed in the palm of his left hand a piece of thick well- 
tanned buckskin, evidently made from the skin of the neck of a 
Fic. 1.—-Obsidian Flake. Fic. 2—Arrowhead of Obsidian. 
deer. It was thick but soft and pliable. On this he laid the 
flake of obsidian, which he held firmly in its place by the first 
three fingers of the same hand. He then rested the elbow on 
the left knee, which gave the left arm and hand holding the flake, 
firm and steady support. He then took in his right hand the 
larger of the two deer prongs, which, as has been stated, had its 
point sharpened in the form of a square file, and holding it as an 
engraver of wood holds his cutting instrument, he commenced 
reducing one edge of the circular form of the flake to a straight 
line. With the thumb of the right hand resting on the edge of 
the left palm as a fulcrum, the point of the deer prong would be 
made to rest on about an eighth of an inch or less of the edge of 
