The design of the party had been to cross the first range of the mountains and gain the valley of the Platte beyond, but this they found themselves unable to accomplish. After climbing successively to the summit of several ridges which they had supposed to be the top of the mountain, they still found others beyond higher and more rugged. They therefore relinquished the intention of crossing, and began to look for the best way to descend to the bed of the river, which lay on their left hand. Here they halted to rest for a few moments, and exposed a thermometer in the shade of a large rock. The mercury fell to 72°; in camp, at the same hour it stood at {193} 86°. They were so much elevated above the river, that although they could see it plainly, it appeared like a small brook of two or three yards in width, and though white with foam and spray, caused by the impetuosity of its current, and the roughness of its channel, its "idle chiding could not be heard so high." They could distinguish two principal branches of the Platte—one coming from the north-west, the other from the south; a little below the confluence of these branches, the river turns abruptly to the S. E., bursting through a chasm in a vast mural precipice of naked columnar rocks.[144] [144] The North Fork of the South Platte encloses South Park on the north, flowing from west to east; while the other branch, which retains the name South Platte, encircles South Park on the south and east. The Denver, Leadville, and Gunnison Railroad now enters the mountain district through Platte Cañon. It is probable that Pike entered South Park in 1806 (see volume xvi, note 14); but Long's failure to penetrate the mountains at this point left the famous park unknown, save to wandering hunters, until Frémont's time, more than twenty years later.—ED. About noon the detachment commenced their descent, which cost them no less exertion than their ascent in the morning. Their fatigue was aggravated by thirst, as they met with no water, nor any shade excepting that of projecting rocks in the higher parts of the mountain. They chose a different route from that which they had taken in ascending, intending to descend to the river, with the hope of being able to travel along its bed. They were obliged to assist each other in lowering themselves down precipices; they would have found it impossible to pass singly. On the southern declivity of the mountain, they met with a few ripe currants, but these were hard and juiceless, of a sweetish taste, and aggravated, instead of alleviating their thirst, and were probably the cause of a violent head-ache, with which several of the party were affected soon after eating them. There were also found a few large and delicious raspberries, of a species approaching the flowering raspberry (rubus odoratus), but with smaller leaves, and a more branching stem.