On the third day after leaving the caravan, as we were riding near the Cimmaron, I thought I observed a pronged head disappearing behind a swell in the prairie. My companions were sceptical, and none of them would go with me; so, wheeling out of the trail, I started alone. One of the men, for Gode was behind, kept charge of my dog, as I did not choose to take him with me, lest he might alarm the antelopes. My horse was fresh and willing; and whether successful or not, I knew that I could easily overtake the party by camping-time. I struck directly towards the spot where I had seen the object. It appeared to be only half a mile or so from the trail. It proved more distant--a common illusion in the crystal atmosphere of these upland regions. A curiously-formed ridge, a _couteau des prairies_ on a small scale, traversed the plain from east to west. A thicket of cactus covered part of its summit. Towards this thicket I directed myself. I dismounted at the bottom of the slope, and leading my horse silently up among the cacti plants, tied him to one of their branches. I then crept cautiously through the thorny leaves towards the point where I fancied I had seen the game. To my joy, not one antelope, but a brace of those beautiful animals were quietly grazing beyond; but, alas! too far off for the range of my rifle. They were fully three hundred yards distant, upon a smooth, grassy slope. There was not even a sage bush to cover me, should I attempt to approach them. What was to be done? I lay for several minutes, thinking over the different tricks known in hunter-craft for taking the antelope. Should I imitate their call? Should I hoist my handkerchief, and try to lure them up? I saw that they were too shy; for, at short intervals, they threw up their graceful heads and looked inquiringly around them. I remembered the red blanket on my saddle. I could display this upon the cactus bushes; perhaps it would attract them. I had no alternative, and was turning to go back for the blanket, when, all at once, my eye rested upon a clay-coloured line running across the prairie beyond where the animals were feeding. It was a break in the surface of the plain, a buffalo road, or the channel of an arroyo; in either case the very cover I wanted, for the animals were not a hundred yards from it, and were getting still nearer to it as they fed. Creeping back out of the thicket, I ran along the side of the slope towards a point where I had noticed that the ridge was depressed to the prairie level. Here, to my surprise, I found myself on the banks of a broad arroyo, whose water, clear and shallow, ran slowly over a bed of sand and gypsum. The banks were low, not over three feet above the surface of the water, except where the ridge impinged upon the stream. Here there was a high bluff; and, hurrying round its base, I entered the channel, and commenced wading upward.