On inquiring the cause of the decline of their village, which was shown pretty clearly by the remains of several deserted buildings, an old man, father of the guide, and a person of some distinction, brought forward a woman very much marked with the small-pox, and said, that, when a girl, she was near dying with the disorder which had left those marks, and that the inhabitants of the houses now in ruins had fallen victims to the same disease. WAPPATOO ISLAND AND ROOT. Wappatoo Island is a large extent of country lying between the Multnomah River and an arm of the Columbia. The island is about twenty miles long, and varies in breadth from five to ten miles. The land is high, and extremely fertile, and on most parts is supplied with a heavy growth of cottonwood, ash, and willow. But the chief wealth of this island consists of the numerous ponds in the interior, abounding with the common arrowhead (_Sagittaria sagittifolia_), to the root of which is attached a bulb growing beneath it, in the mud. This bulb, to which the Indians give the name of _wappatoo_, is the great article of food, and almost the staple article of commerce, on the Columbia. It is never out of season; so that, at all times of the year, the valley is frequented by the neighboring Indians who come to gather it. It is collected chiefly by the women, who employ for the purpose canoes from ten to fourteen feet in length, about two feet wide, and nine inches deep, tapering from the middle, where they are about twenty inches wide. They are sufficient to contain a single person and several bushels of roots; yet so light, that a woman can carry one with ease. She takes one of these canoes into a pond where the water is as high as the breast, and, by means of her toes, separates from the root this bulb, which, on being freed from the mud, rises immediately to the surface of the water, and is thrown into the canoe. In this manner, these patient females remain in the water for several hours, even in the depth of winter. This plant is found through the whole extent of the valley in which we now are, but does not grow on the Columbia farther eastward. SCENERY OF THE RIVER AND SHORES. Above the junction of the Multnomah River, we passed along under high, steep, and rocky sides of the mountains, which here close in on each side of the river, forming stupendous precipices, covered with the fir and white cedar. Down these heights frequently descend the most beautiful cascades,--one of which, a large stream, throws itself over a perpendicular rock, three hundred feet above the water; while other smaller streams precipitate themselves from a still greater elevation, and, separating into a mist, again collect, and form a second cascade before they reach the bottom of the rocks.