When Big Pete told me that his park was “walled in” he told me the mildest sort of truth; the prairie is the bottom of a wide canyon, in fact everything seems to indicate that the whole park had settled, sunk—“taken a drop” of a thousand or more feet; forming what miners would call a fault. From the glaciers up among the clouds numerous streams of melted ice came dashing down the sides of the mountain range, fanciful cascades leaping without fear from most stupendous heights spreading out in long horse-tail falls over the face of the cliff, doing everything but looking real. At the foot of each of the falls there was a pool of deep water, in one or two instances the pools were smooth basins hollowed out of solid rock in which the water was as transparent as air and but for the millions of air bubbles caused by the falling water every inch of bottom could be plainly seen by an observer at the brink of the pool. The trout in these basins were almost as colorless as the water itself (the light color of the fish is due to their chameleon-like power of modifying their hue to imitate their surroundings)—this mimicry is so perfect that after looking into one of these stone basins, the rounded smooth sides of which offered no shade or nook where a trout might hide, I was ready to declare the waters uninhabited but no sooner had my brown hackel or professor settled lightly on the surface of the pool than out from among the air bubbles a fish appeared and seized the fly. My sprained ankle was now so much improved that upon discovering a diagonal fracture in the face of the cliff, which looked as if offering a foot hold, and feeling reckless, I determined to make the effort to scale the wall at this point. If the giant “fault” is of comparatively recent occurrence, geologically speaking, it seemed reasonable that there would be trout in the streams above the cliff and the memory of the fact that Pete had reported that both Rocky Mountain sheep and goats were up there decided me to attempt to scale the wall by the fracture. It was a long, hard climb and more than once while I clung to the chance projections or dug my fingers into small cracks and looked down upon the backs of some golden eagle sailing in spirals below me, I regretted making the fool-hardy attempt, but when the top was reached and I saw signs of sheep and had a peep at a white object I took to be a goat, I felt repaid for my arduous climb.