I slid down the dead pinyon and jumped nearly twenty feet to the soft sand below, and after putting a loaded clip in my rifle, began kangaroo leaps down the slope. When I reached the point where the cougar had entered the slide, I called the hounds, but they did not come nor answer me. Notwithstanding my excitement, I appreciated the distance to the bottom of the slope before I reached it. In my haste, I ran upon the verge of a precipice twice as deep as the first rim wall, but one glance down sent me shatteringly backward. With all the breath I had left I yelled: "Waa-hoo! Waa-hoo!" From the echoes flung at me, I imagined at first that my friends were right on my ears. But no real answer came. The cougar had probably passed along this second rim wall to a break, and had gone down. His trail could easily be taken by any of the hounds. Vexed and anxious, I signaled again and again. Once, long after the echo had gone to sleep in some hollow cañon, I caught a faint "Wa-a-ho-o-o!" But it might have come from the clouds. I did not hear a hound barking above me on the slope; but suddenly, to my amazement, Sounder's deep bay rose from the abyss below. I ran along the rim, called till I was hoarse, leaned over so far that the blood rushed to my head, and then sat down. I concluded this cañon hunting could bear some sustained attention and thought, as well as frenzied action. Examination of my position showed how impossible it was to arrive at any clear idea of the depth or size, or condition of the cañon slopes from the main rim wall above. The second wall—a stupendous, yellow-faced cliff two thousand feet high—curved to my left round to a point in front of me. The intervening cañon might have been a half mile wide, and it might have been ten miles. I had become disgusted with judging distance. The slope above this second wall facing me ran up far above my head; it fairly towered, and this routed all my former judgments, because I remembered distinctly that from the rim this yellow and green mountain had appeared an insignificant little ridge. But it was when I turned to gaze up behind me that I fully grasped the immensity of the place. This wall and slope were the first two steps down the long stairway of the Grand Cañon, and they towered over me, straight up a half-mile in dizzy height. To think of climbing it took my breath away. Then again Sounder's bay floated distinctly to me, but it seemed to come from a different point. I turned my ear to the wind, and in the succeeding moments I was more and more baffled. One bay sounded from below and next from far to the right; another from the left. I could not distinguish voice from echo. The acoustic properties of the amphitheater beneath me were too wonderful for my comprehension.