While at Diaz City I had learned from Dr. W. Derby Johnson, the ecclesiastical head of the Mormon colonies in Upper Chihuahua, that at the lower colony on the Piedras Verdes River a number of ancient Aztec ruins were to be seen, very few of which had ever been heard of before. I determined to visit them as soon as possible, for the reason that Mr. Macdonald, the business manager of the lower colony, was expecting to leave shortly for Salt Lake City. This gentleman was unusually well acquainted with the country of the Piedras Verdes, having spent months in surveying it, and being more familiar with its ancient ruins than any other man living. Fortunately Dr. Johnson was going through to see him--a two days' trip--so to a certain extent we joined our forces for that time. Expecting to return to Corralitos, we left early one morning for a drive of about sixty miles to the lower Mormon colony of Juarez, named after Mexico's greatest President since the war of independence. Twenty-five or thirty miles to the south of Corralitos we came to the town of Casas Grandes, said to consist of three thousand inhabitants, but we did not see three people as we drove through its seemingly deserted streets. It is the most important town in the valley, both historically and in point of numbers. It takes its name, meaning "big houses," from the ancient ruins situated in its suburbs, and comprising the largest found in this part of Mexico when it was first visited by Europeans many years ago. The name of the town has also been applied to the river which flows just in front of it, and which is formed by the junction of two others, the San Miguel and Piedras Verdes. The San Miguel is the straight line prolongation of the Casas Grandes, and is apparently the true stream; but the Piedras Verdes is the more important, as its waters are perennially replenished by branches which rise in the never-failing springs of the sierras to the west. At Casas Grandes we left the river and struck out inland for the little Mormon colony on the Piedras Verdes River, a distance of some twenty or twenty-five miles. Like all other distances in this part of Mexico, there is not a sign of civilization between, not even a camping place, although the country traversed is a fine one for cattle grazing, with numerous beautiful valleys where farms could be made remunerative, and where three or four dozen houses ought to be seen if a tenth part of the country's resources were developed. As we crossed stretch after stretch of beautiful prairie, watered by many little mountain streams, it seemed as though only a short time must pass before this fertile country would be dotted with hundreds of homes and thousands of cattle on its grassy hills. The meaning of Piedras Verdes is green rocks, but the rock projections in cliff, hill, or stream, are of all imaginable shades, not only of green, but of red, yellow, brown, rose, and even blue. The effect is inconceivably beautiful against the wonderful blue