The remains of a wonderful irrigation system long concealed have recently been uncovered in Arizona. Says the Mining and Scientific Press, of it:— “During my last visit to Arizona, I saw in the Salt River Valley a sight that would strike a stranger as queer. A steam dredging-screw, such as is used in deepening rivers and harbors for navigation, was voyaging slowly and steadily thru a wide strip of arid desert. It was started landward from Salt River, and was excavating its own channel ahead, the river waters following and floating it as it advanced. But the work was not, in fact, the making of a new channel, but the digging out of an old one, the irrigating canal made by a civilized people that lived and flourished and departed before recorded American history began. That there was a time when this wide valley, now being again redeemed to man, was a garden of plenty, teeming with inhabitants, is shown by the extensive and regular system of broad canals leading from the river thru which water for irrigating was conveyed for centuries. With the drifting sands and earth, these canals are still plainly indicated on the face of the ground, and so skillfully were they planned and built that modern engineering science applied to irrigation can do no better than retrace their course and restore them. What race laid out the canals and built the towns whose ruins are strung along the valley is a question not yet settled by archæologists. Aztecs or Toltecs, or each in their turn, probably tarried here in their centuries long southward to the valley of Mexico, and the ruins may be of an older people than either of them.”