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Show 19 between the McElmo and Lower Mancos drainage. It is stated by Captain Moss and others who have been in this locality that up to within two or three years there has been a living- spring at this place, and the spot has been christened by them Aztec Springs. The site of the spring I found, but without the least appearance of water. The depression formerly occupied by it is near the center of a large mass of ruins, similar to the group last described, but having a rectangular instead of a circular building as the chief and central structure. This I have called the upper house'xn the plate, and a large walled iuclosure a little lower on the slope, I have, for the sake of distinction, called the lower house. These ruins form the most imposing pile of masonry yet found in Colorado. The whole group covers au area of about four hundred and eighty thousand square feet, and has an average depth of from three to four feet. This would give in the vicinity of one million five hundred thousand solid feet of stone- work. The stone used is chiefly of the fos-siliferous limestone that outcrops along the base of the Mesa Verde a mile or more away, and its transportation to this place has doubtless been a great work for a people so totally without facilities. The npper house is rectangular, measures 80 by 100 feet, and is built vith the cardinal points to within five degrees. The pile is from 12 to 13feet in height, and its massiveness suggests an original height at least twice as great. The plan is somewhat difficult to make out on account of the very great quantity ofdibris. The wall8 seem to have been double, with a space of 7 feet between; a number of cross- walls at regular intervals indicate that this space has been divided into apartments, as seen in the plan. The walls are 26 inches thick, and are built of roughly- dressed stones, which were probably laid in mortar, as in other cases. The inclosed space, which is somewhat depressed, has two lines of dflrit, probably the remains of partition- walls, separating it into the three apartments, a, 6, c. Inclosing this great house is a net- work of faiJen walls, so completely reduced that none of the stones seem to remain in place; and I am at a loss to determine whether they mark the site of a cluster of irregular apartments, having low, loosely- built walls, or whether they are the remains of some imposing adobe structure built after the manner of the ruined pueblos of the Bio Chaco. Two well- defined circular inclosures or estufas are situated in the midst of the southern wing of the ruin. The upper one, A, is on the opposite side of the spring from the great house, is 60 feet in diameter, and is surrounded by a low stone wall. West of the house is a. small open court, which seems to have had a gate- way opening out to-the west, through the surrounding walls. The lower house is 200 feet in length by 180 in width, and its walla vary fifteen degrees from the cardinal points. The northern wail, a, is doable, and contains a row of eight apartments about 7 feet in width by 24 in length. The walls of the other sides are low, and seem to have served simply to inclose the great court, near the center of which is a large walled depression, ( estufa B.) No other ruins were observed in the neighborhood of these, although small groups are said to exist along the base of the Late Mountains, a few miles to the southwest. PLATE X.- RUIN AT OJO CALIENTE, NEW MEXICO. For the sake of comparison, I present in Plate X, the ground- plan of a ruined pueblo found at Ojo Caliente, New Mexico. It occurs on a high, |