Following the course of the Gila river for some time, we struck the desert again, beyond Gila Bend. What struck me as very surprising was, that the desert here did not look like a desert at all: the scattering _verde_-bushes and growth of cactus hiding the sand from one's eyes, always just a little distance ahead--the cacti growing so thickly in some places that, when they are in blossom, their flowers form a mosaic of brilliant hues. Some of them are very curious--particularly the "monument cactus," a tall shaft, growing to a height of over thirty feet, sometimes with arms branching out on either side, more generally a simple obelisk, covered with thorns from three to four inches long. We were now nearing Maricopa Wells and the Pimo villages. Phil was the pearl of all drivers; and he recounted traditions and legends belonging to the past of this country that even Prescott might have wished to hear. Phil had studied the history of the country in his own way, and had evidently not kept his eyes closed while travelling back and forth through Arizona. Halting the ambulance one day, he assisted me to alight near a pile of rocks the most wonderful it was ever my fortune to behold. He called them Painted Rocks, or Sounding Rocks; and his theory in regard to them was, that this had been a place where the Indians had long ago met to perform their religious rites and ceremonies. Rocks of different sizes--from those not above a foot high, to others that reached almost to my shoulders--all rounded in shape, were here, in the midst of the plain, gathered together within a space of twenty or thirty feet. They were black--whether from the action of the weather merely, or from some chemical process--and covered on all sides with representations from the animal world of Arizona and Mexico. The pictures had been engraved, in a rude manner, on the black ground, and embraced, in their variety, snakes, lizards, toads; also, four-footed animals, which I could conscientiously recognize neither as horses nor antelopes. Were they horses, it would go to prove that these pictures had been made by roving bands of Indians, any time after the conquest, as it is held that horses were first brought to this country by Cortez. Did the pictures represent antelopes, it would almost tempt me to believe that it was a specimen of the picture-writing of the Aztecs. The sun was also represented, with its circle of rays, which, in Phil's estimation, was proof conclusive that the heathens had come here only to worship, particularly as there was no water in the neighborhood, and they could not have lived here for any length of time. What the character of the rocks may be, I am not geologist enough to know; but when struck they emit a peculiarly clear and ringing sound, like that produced by striking against a bell or a glass. None of the tribes now to be found in that part of the country appear to claim any knowledge of the origin of these rocks.