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 farther, and encamped late in the evening on the Pavilion river.[179] The Nez-percé and Spokane plain is at least a thousand feet elevated above the bed of the river. It is dry, stony, undulating, covered with bunch and nutritious grass, with prickly pear and wormwood. The basaltic and volcanic formations which extend through the whole of this region, are really wonderful. We frequently passed ponds and small lakes embedded between walls of basaltic rocks—immense ranges of dark shining pillars, as if forced from the bosom of the plain, extend for some miles, resembling, not unfrequently, forts and ancient ruined cities and castles. We encamped several times near small but beautiful lakes, where ducks and geese, with their young broods, were swimming in great numbers. The Indians frequent these regions in search of the bitter and camash roots, very abundant here. In every one of their old encampments we observed great quantities of prairie-turtle shells, a proof of their being numerous and serving as food for the savages. Pheasants or quails were very abundant—we daily killed what we wanted for our meals.

{242} On the fifth day of our departure from Walla Walla, we reached the Spokane river,[180] and found a good fording for our animals. You will see with pleasure the chart I have made of the head waters of this river, which, though beautiful and interesting, is yet, like all the other rivers in Oregon, almost an unbroken succession of rapids, falls, and cascades, and of course ill-adapted in its present condition to the purposes of navigation. The two upper