{283} On the following morning [5th] one of our hunters fortunately discovered the same horse standing asleep under the shade of a tree, and having shot him, returned immediately to camp with the intelligence. We had all suffered so severely from hunger, and our present want of provisions was so great, that instead of questioning whether we should eat the flesh of a horse, we congratulated ourselves on the acquisition of so seasonable a supply. We felt a little regret at killing so beautiful an animal, who had followed us several miles on the day before, and had lingered with a sort of confidence about our camp; but our scruples all yielded to the loud admonitions of hunger. The [next] day being Sunday, and the plain about our camp affording a supply of grass for our jaded horses, we resolved to remain encamped, seizing the opportunity of making observations for latitude, &c. The morning was calm and clear; the mercury at 69° Fah. For five mornings preceding this it had been at 58°, and in the middle of each day rose to above 90°. The moon was now too near the sun to admit of observations by lunar distances; but the meridional altitude of the sun's lower limb was taken with great care, and under circumstances favourable to accuracy, gave 35° 16′ 19″ for the latitude of our encampment. The river bed in the front of our camp was found by admeasurement to be sixty yards in width, twenty of which were naked sand-bar, the remaining forty covered with water, having an average depth of about ten inches. The current is moderate, the water intensely red, having nearly the temperature and the saltness of new milk. It suspends a great quantity of clay, derived from the cement of the sand-rock; but notwithstanding its impurities, it is more grateful to the taste than any we had met with since leaving the mountains, and though drank in large quantities, produces no unpleasant effect. {284} Some spots in the low plains had here considerable fertility, depending probably, in some degree, upon the intermixture of a large proportion of calcareous matter with the soil, resulting from the disintegrated sand-rock. Though no extensive formation, a limestone appears, yet the sandstone has, in many instances, a calcareous cement; but is traversed by numerous veins, both of gypsum and carbonate of lime.