During the summer of 1882 Dr. Hoffman visited the Tule river agency, California, where he found a large rock painting, of which Fig. 983, infra, is a copy made by him. His description of it is as follows:
“The agency is upon the western side of the Sierra Nevada, in the headwater canyons of the branches of the south fork of Tule river. The country is at present occupied by several tribes of the Mariposan linguistic stock, and the only answer made to inquiries respecting the age or origin of the painting was that it was found there when the ancestors of the present tribes arrived. The local migrations of the various Indian tribes of this part of California are not yet known with sufficient certainty to determine to whom the records may be credited, but all appearances with respect to the weathering and disintegration of the rock upon which the record is engraved, the appearance of the coloring matter subsequently applied, and the condition of the small depressions made at the time for mixing the pigments with a viscous substance, indicate that the work was performed about a century ago.
“The Indians now at Tule river have occupied that part of the state for at least one hundred years, and the oldest now living state that the records were found by their ancestors, though whether more than two generations ago could not be ascertained.
“The drawings were outlined by pecking with a piece of quartz or other siliceous rock, the depth varying from a mere visible depression to a third of an inch. Having thus satisfactorily depicted the several ideas, colors were applied which appear to have penetrated the slight interstices between the crystalline particles of the rock, which had been bruised and slightly fractured by hammering with a piece of stone. It appears probable, too, that to insure better results the hammering was repeated after application of the colors.
“Upon a small bowlder, under the natural archway formed by the breaking of the large rock, small depressions were found which had been used as mortars for grinding and mixing the colors. These depressions average 2 inches in diameter and about 1 inch in depth. Traces of color still remain, mixed with a thin layer of a shining substance resembling a coating of varnish and of flinty hardness. This coating is so thin that it can not be removed with a steel instrument, and appears to have become a part of the rock itself.