hand. I am inclined to ascribe the process of removal more to the
hydraulic effect of the tears thus started than to the mechanical jar
of the treatment.

He began this work by taking one chunk of obsidian and throwing it
against another; several small pieces were thus shattered off. One of
these, approximately three inches long, two inches wide and half an
inch thick, was selected as suitable for an arrowhead, or _haka_.
Protecting the palm of his left hand by a piece of thick buckskin, Ishi
placed a piece of obsidian flat upon it, holding it firmly with his
fingers folded over it.

In his right hand he held a short stick on the end of which was lashed
a sharp piece of deer horn. Grasping the horn firmly while the longer
extremity lay beneath his forearm, he pressed the point of the horn
against the edge of the obsidian. Without jar or blow, a flake of glass
flew off, as large as a fish scale. Repeating this process at various
spots on the intended head, turning it from side to side, first
reducing one face, then the other, he soon had a symmetrical point. In
half an hour he could make the most graceful and perfectly proportioned
arrowhead imaginable. The little notches fashioned to hold the sinew
binding below the barbs he shaped with a smaller piece of bone, while
the arrowhead was held on the ball of his thumb.

Flint, plate glass, old bottle glass, onyx--all could be worked with
equal facility. Beautiful heads were fashioned from blue bottles and
beer bottles.

The general size of these points was two inches for length,
seven-eighths for width, and one-eighth for thickness. Larger heads