A few days later it was convenient to return to the Onyx Cave ranch with the special object of entering the newest cave, which could be done with the assistance of seventy feet of rope. While necessary preparations were pending, a walk up the canon was proposed. At a distance of perhaps a quarter of a mile above Onyx Cave evidence was seen of a very remarkable form of ancient life. It is not the usual few bones but is a cast in the rock of the canon bed of an animal clothed in its flesh. The appearance of the head, neck, body and wings is preserved, but the tail and four limbs have been carried away by eroding waters which even now have not quite forsaken the canon. The containing stratum is not seen in the canon wall, and near the lower end of the canon a fine white sandstone crops out beneath. We ask: "Was the canon cut to its full depth while yet a Cretaceous sea was depositing beach-sand, and did the earliest horse, with wings, appear at the close of that period? Or, did an animal with fore limbs developed, retain its wings into Miocene time and leave record of its life in an arm of the Tertiary lake?" The body is that of a horse with wings attached to the shoulders. The head is unlike that of a modern horse, being much shorter and more rounded, but the parted lips give a glimpse of the teeth of a young horse. If only the feet could be found, I feel assured they would prove that the three-toed horse of ancient time, so abundantly in evidence throughout this region, was possessed of wings and in some way furnished the idea of Pegasus. A few feet further down the canon are a pair of twisted wings that show the animal to have perished in company with its mate, while trying to escape from a sudden flood that rushed down the canon like a moving wall. After some uneasy discussion about the means of entering the new cave, it was finally decided that the available rope was too short and not of sufficient strength. This was, of course, a disappointment but not a surprise, as a very peculiar quality in the rope used to enter caves of this kind had come to notice before. The peculiarity is, that a rope entirely above suspicion for the safety of a two hundred pound man, at once weakens and must be condemned when threatened with one hundred pounds of woman's weight, yet there is an implied compliment hidden somewhere about this protective system that tends to reduce the sting of disappointment. So it was agreed to spend the afternoon in the White Onyx Cave, which is generally spoken of simply as the Upper Cave because it occupies a higher level than the Onyx Cave already described, and is supposed to be an extension of the same although no connecting passage has been discovered. The accompanying friend had not been costumed for caving, but was persuaded to accept a full suit of overalls, which needed the addition of a pick and pipe to make the picture perfect. Unfortunately a snap shot failed.