The Rio Mancos, that we have just mentioned, was a favorite place of resort for these old people. This stream, rising in the La Platte Mountains, flows through beautiful valleys to a great table-land known as the Mesa Verde. Mr. Jackson explored this valley in 1874, and he reports as follows: “Commencing our observation in the park-like valley of the Mancos, between the mesa and the mountains, we find that the low benches which border the stream upon either side bear faint vestiges of having at some far away time been covered with dwellings, grouped in communities apparently, but so indistinct as to present to the eye little more than unintelligible mounds. By a little careful investigation, however, the foundation of great square blocks of single buildings and of circular inclosures can be made out, the latter generally of a depressed center, showing an excavation for some purpose.” From this description we can not quite make out whether these ruins are great communal buildings, like the modern pueblo, or clusters of separate houses. We incline to the latter opinion, however. The circular depressed area was doubtless used as an Estufa, the place of religious meetings for men alone. “The greater portion of these mounds are now overgrown with artemisia, pinion-pine, and cedar, concealing them almost entirely from casual observation.” “We found the surest indication of their proximity in the great quantity of broken pottery which covered the ground in their neighborhood. The same curiously indented, painted, and glazed ware, was found throughout New Mexico and Arizona. It was all broken into very small pieces, none that we could find being larger than a silver dollar.” Specimens of this pottery will be figured in its appropriate place. “Nowhere among these open plane habitations could we discover any vestige of stone-work, either in building material or implements. It is very evident that the houses were all of adobe, the mound-like character of the remains justifying that belief.” In this last respect we note a difference between these remains and those already described. The mesa verde is one of those elevated plateaus we have so often described. Through this the Mancos has cut a cañon nearly thirty miles in length, and from one to two thousand feet deep. The description we have already given is of the valley of the river before coming to the cañon.