One of the most surprising features of the Grand canon is its cleanness--its freedom from debris. It is a home of the gods, swept and garnished; no litter or confusion or fragments of fallen and broken rocky walls anywhere. Those vast sloping taluses are as clean as a meadow; rarely at the foot of the huge vertical walls do you see a fragment of fallen rock. It is as if the processes of erosion and degradation were as gentle as the dews and the snows, and carved out this mighty abyss grain by grain, which has probably been the case. That much of this red sandstone, from the amount of iron it contains, or from some other cause, disintegrates easily and rapidly, is very obvious. Looking down from Hopi Point upon a vast ridge called the "Man-of-War," one sees on the top, where once there must have been a huge wall of rock, a long level area of red soil that suggests a garden, the more so because it is regularly divided up into sections by straight lines of huge stone placed as if by the hands of man. One's sense of the depths of the canyon is so great that it almost makes one dizzy to see the little birds fly out over it, or plunge down into it. One seems to fear that they too will get dizzy and fall to the bottom. We watched a line of tourists on mules creeping along the trail across the inner plateau, and the unaided eye had trouble to hold them; they looked like little red ants. The eye has more difficulty in estimating sizes and distances beneath it than when they are above or on a level with it, because it is so much less familiar with depth than with height or lateral dimensions. Another remarkable and unexpected feature of the canyon is its look of ordered strength. Nearly all the lines are lines of greatest strength. The prevailing profile line everywhere is that shown herewith. The upright lines represent lines of cyclopean masonry, and the slant is the talus that connects them, covered with a short, sage-colored growth of some kind, and as soft to the eye as the turf of our fields. The simple, strong structural lines assert themselves everywhere, and give that look of repose and security characteristic of the scene. The rocky forces always seem to retreat in good order before the onslaught of time; there is neither rout nor confusion; everywhere they present a calm upright front to the foe. And the fallen from their ranks, where are they? A cleaner battlefield between the forces of nature one rarely sees. The weaker portions are, of course, constantly giving way. The elements incessantly lay siege to these fortresses and take advantage of every flaw or unguarded point, so that what stands has been seven times, yea, seventy times seven times tested, and hence gives the impression of impregnable strength. The angles and curves, the terraces and foundations, seem to be the work of some master engineer, with only here and there a toppling rock.