April 22.--We began our march at seven o'clock. We had just reached the top of a hill near the village, when the load of one of the horses turned; and the animal, taking fright at a robe which still adhered to him, ran furiously toward the village. Just as he came there, the robe fell, and an Indian made way with it. The horse was soon caught; but the robe was missing, and the Indians denied having seen it. These repeated acts of knavery had quite exhausted our patience; and Capt. Lewis set out for the village, determined to make them deliver up the robe, or to burn their houses to the ground. This retaliation was happily rendered unnecessary; for on his way he met two of our men, who had found the robe in one of the huts, hid behind some baggage. April 24.--The Indians had promised to take our canoes in exchange for horses; but, when they found that we were resolved on travelling by land, they refused giving us any thing for them, in hopes that we would be forced to leave them. Disgusted at this conduct, we determined rather to cut them in pieces than suffer these people to possess them; and actually began to do so, when they consented to give us several strands of beads for each canoe. We had now a sufficient number of horses to carry our baggage, and therefore proceeded wholly by land. Passing between the hills and the northern shore of the river, we had a difficult and fatiguing march over a road alternately sandy and rocky. The country through which we have passed for several days is of uniform character. The hills on both sides of the river are about two hundred and fifty feet high, in many places presenting a perpendicular face of black, solid rock. From the top of these hills, the country extends, in level plains, to a very great distance, and, though not as fertile as land near the falls, produces an abundant supply of low grass, which is an excellent food for horses. The grass must indeed be unusually nutritious: for even at this season of the year, after wintering on the dry grass of the plains, and being used with greater severity than is usual among the whites, many of the horses were perfectly fat; nor had we seen a single one that was really poor. Having proceeded thirty-one miles, we halted for the night not far from some houses of the Walla-wallas. Soon after stopping, we were joined by seven of that tribe, among whom we recognized a chief by the name of Yellept, who had visited us in October last, when we gave him a medal.