FIG. 1. Knocking off chips from a core of obsidian by means of the stone hammer and pitching tool of antler; one person operating.

FIG. 2. Knocking off chips from a core of obsidian by means of the stone hammer and pitching tool of antler; two persons operating.

FIG. 3. Pressing off flakes from a blade of siliceous stone by means of the bone flaker, the operator holding the blade against the ball of the thumb and pressing from him.

FIG. 4. Pressing off flakes from a blade of siliceous stone by means of a bone flaker, the operator holding the blade on the palm of the hand and pressing downward. Frequently the hand is gloved or a bit of rawhide is first laid upon the palm.

FIG. 5. Pressing off flakes from a bit of siliceous stone by means of the bone flaker, the operator holding the block upon a bit of wood with his left hand and pressing downward with the right. This is a very effectual mode of working.

FIG. 6. Fastening the arrowhead upon the shaft by means of a filament of moist sinew. The shaft is held firmly under the left arm for a bearing, held and revolved by the left hand, and the moist filament of sinew is held tight and guided by the right hand.