48 PICTURE-WRITING OF THE AMERICAN INDIANS. 
ARIZONA. 
Mr, G. K, Gilbert, of the U. S. Geological Survey, gives the follow- 
ing information concerning petroglyphs observed by him in the vicinity 
of San Francisco mountain, Arizona: 
The localities of the sketches Figs. 5, 6, and 7 are about 35 miles east and south- 
Fic. 5.—Petroglyph in Arizona. 
east of San Francisco mountain, the material being a red sandstone, which stands 
in low buttes upon the plain. About these are mealing stones, fragments of pottery 
and chipped flints, giving evidence of the residence of sedentary Indians. So many 
localities of petroglyphs were seen that I regard it as probable that a large number 
Fic. 6.—Petroglyph in Arizona. 
could be found by search. ‘The drawings in every case but one were produced by 
blows.upon the surface of the rocks, breaking through the film of rock discolored by 
weathering so as to reveal (originally) the color of the interior of the rock. The 
