The sand-rock, which in some places is exposed in perpendicular precipices, is soft and friable, being very readily scratched with the point of a knife, and has been rudely inscribed, probably by the Indians, with emblematic figures commemorative of some past event. Several of the figures intended to represent men are distinguished by the sign of the cross inscribed near the head; some are represented smoking, and some leading horses, from which we infer, that the inscriptions are intended to commemorate some peaceful meeting of the Indians with the Spaniards of N. Mexico for the purposes of trade, when horses were either given as presents or bartered for other articles. Some meeting of this kind has probably happened here at no very distant period, as corn cobs were found near our encampment. From this circumstance it would appear, that the distance to the Spanish settlements cannot be very great. Mr. Peale, who had been unwell since the cold storm of the 28th, now found some relief in the {276} opening of an abscess which had formed upon his jaw. As several of our horses had been lamed in descending into the valley, and by the rough journey of the preceding day, it was thought necessary to allow ourselves a day of rest. Since arriving in the country inhabited by the hitherto undescribed animal called the black-tailed or mule deer, we had been constantly attentive to the important object of procuring a complete specimen for preservation and description. Hitherto, though several had been killed, none had been brought to camp possessing all the characters of the perfect animal. Supposing we should soon pass beyond their range, a reward had been offered to the hunter who should kill and bring to camp an entire and full-grown buck. Verplank killed one of this description, on the afternoon of the 1st of August, near enough our camp to call for assistance, and bring it in whole. They did not arrive until dark, and we had such pressing necessity for the flesh of the animal, that we could not defer dressing it until the next morning. The dimensions were accordingly taken, and a drawing made by Mr. Peale, the requisite light being furnished by a large fire. Verplank informed us, that in company with the buck which he killed, were five does, two of the common red deer, (C. virginianus) and three of the other kind.[53] We observed about this camp, a yellow-flowering sensitive plant, apparently a congener to the saw-brier, (schrankia uncinata) of the Platte and Arkansa. Its leaves are twice pinnated, and manifestly irritable. We also added to our collection, two new species of gaura, smaller than G. mollis, which is also found here.