At two o'clock we reach the mouth of the Colorado Chiquito. This stream enters through a canyon on a scale quite as grand as that of the Colorado itself. It is a very small river and exceedingly muddy and saline. I walk up the stream three or four miles this afternoon, crossing and recrossing where I can easily wade it. Then I climb several hundred feet at one place, and can see for several miles up the chasm through which the river runs. On my way back I kill two rattlesnakes, and find on my arrival that another has been killed just at camp. August 11.--We remain at this point to-day for the purpose of determining the latitude and longitude, measuring the height of the walls, drying our rations, and repairing our boats. Captain Powell early in the morning takes a barometer and goes out to climb a point between the two rivers. I walk down the gorge to the left at the foot of the cliff, climb to a bench, and discover a trail, deeply worn in the rock. Where it crosses the side gulches in some 242 CANYONS OF THE COLORADO. places steps have been cut. I can see no evidence of its having been traveled for a long time. It was doubtless a path used by the people who inhabited this country anterior to the present Indian races--the people who built the communal houses of which mention has been made. I return to camp about three o'clock and find that some of the men have discovered ruins and many fragments of pottery; also etchings and hieroglyphics on the rocks. We find to-night, on comparing the readings of the barometers, that the walls are about 3,000 feet high--more than half a mile--an altitude difficult to appreciate from a mere statement of feet. The slope by which the ascent is made is not such a slope as is usually found in climbing a mountain, but one much more abrupt--often vertical for many hundreds of feet,--so that the impression is given that we are at great depths, and we look up to see but a little patch of sky. Between the two streams, above the Colorado Chiquito, in some places the rocks are broken and shelving for 600 Or 700 feet; then there is a sloping terrace, which can be climbed only by finding some way up a gulch; then another terrace, and back, still another cliff. The summit of the cliff is 3,000 feet above the river, as our barometers attest. Our camp is below the Colorado Chiquito and on the eastern side of the canyon.