After making thirty-three miles, they encamped among loose sand, one hundred feet above the water of the river. Many rattlesnakes were found in this vicinity.

Owing to the quantities of mosquitoes, combined with the fear of snakes, the party obtained little or no rest, and were all glad to mount their horses and proceed on their way.

In the early part of the day, they arrived at the junction of the Spipen with the Yakima: previous to this they crossed another branch, coming in from the southwest; the waters of the latter were very turbid, of a dark-brown colour, and it was conjectured that it had its source at or near Mount Rainier. Along its banks was seen a range of basaltic columns. The Yakima was crossed during the day in canoes, the river not being yet fordable.

The country, which had for some days exhibited the appearance of the Tillandsia districts of Peru, had now begun to acquire a tinge of green, and some scattered pine trees had become visible. Some small oaks were passed, which appeared of a local character. This night they again had a number of rattlesnakes in their camp.

On the 8th, the valley had narrowed, and the banks becoming more perpendicular, they had a great many difficulties to encounter. They stopped at the camp of old Tidias, whom, it will be recollected, they had encountered after crossing the mountains, and from whom they obtained some horses. They soon afterwards arrived at the path where they had turned off to the north. The river had fallen very much during their absence, and there was a marked difference in the season, the vegetation being much more backward than in the parts they had recently visited. The berries were just beginning to ripen, while in the plains, not twenty miles distant, they were already over. Old Tidias determined to accompany them to Nisqually, taking with him his son, and lending them several horses. The Spipen, up which they passed, was now hemmed in by mountain ridges, occasionally leaving small portions of level ground. They encamped at the place they had occupied on the 30th of May.

The vegetation, since they had passed this place, had so much advanced that they had difficulty in recognising it again. The wet prairies were overgrown with rank grass, from one to two feet in height. After a short rest at the foot of the mountain, they began its ascent, and reached the crest of the ridge in about three hours. On every side they found a low growth of shrubs, which they had not suspected when it was covered with snow, and causing the summit to differ essentially from the broad ridge they had crossed between the Yakima and Pischous rivers. They encamped for the night on the edge of a wet prairie, which afforded pasturage for their horses.

The next day they passed through several similar prairies, and descended the western slope of the mountain, where they found more patches of snow than on the east side. This was just the reverse of what they had found on their previous passage; the season, too, was evidently much less advanced. This circumstance was supposed to be owing to the denser forest on the west, as well as the absence of elevated plains.

They encamped the same night at the little prairie before spoken of, at the foot of the western slope. Before reaching it, they met a party of men and women carrying a sick chief over the mountain, who was evidently dying. It was affecting to see him stretching forth his hand to them as they passed, as if desiring to be friends with all before he died. He died the same night.

The two next days it rained almost constantly, but they found the road much less difficult to travel than before, and the streams were fordable, which enabled them to make more rapid progress.

On the 13th, they passed the Smalocho, and on the 15th reached Nisqually, all well; having performed a journey of about one thousand miles without any material accident, except those that have been related as having occurred to the instruments. They traversed a route which white men had never before taken, thus enabling us to become acquainted with a portion of the country about which all had before been conjecture. They had also made a large addition to our collection of plants.