May 5.--Almost the only instance of rudeness we encountered in our whole trip occurred here. We made our dinner on two dogs and a small quantity of roots. While we were eating, an Indian standing by, and looking with great derision at our eating dog's-flesh, threw a half-starved puppy almost into Capt. Lewis's plate, laughing heartily at the humor of it. Capt. Lewis took up the animal, and flung it back with great force into the fellow's face, and, seizing his tomahawk, threatened to cut him down if he dared to repeat such insolence. He went off, apparently much mortified; and we continued our dog-repast very quietly. Here we met our old Chopunnish guide and his family; and soon afterward one of our horses, which had been separated from the others in the charge of Twisted-hair, was caught, and restored to us. THE WALLA-WALLA. We reached (May 1) a branch of the Walla-walla River. The hills of this creek are generally abrupt and rocky; but the narrow bottom bordering the stream is very fertile, and both possess twenty times as much timber as the Columbia itself. Indeed, we now find, for the first time since leaving Fort Clatsop, an abundance of firewood. The growth consists of cotton-wood, birch, the crimson haw, willow, choke-cherry, yellow currants, gooseberry, honeysuckle, rose-bushes, sumac, together with some corn-grass and rushes. The advantage of a comfortable fire induced us, as the night was come, to halt at this place. We were soon supplied by Drewyer with a beaver and an otter; of which we took only a part of the beaver, and gave the rest to the Indians. The otter is a favorite food, though much inferior, in our estimation, to the dog, which they will not eat. The horse, too, is seldom eaten, and never except when absolute necessity compels. This fastidiousness does not, however, seem to proceed so much from any dislike to the food as from attachment to the animal; for many of them eat very freely of the horse-beef we give them. There is very little difference in the general face of the country here from that of the plains on the Missouri, except that the latter are enlivened by vast herds of buffaloes, elks, and other animals, which are wanting here. Over these wide bottoms we continued, till, at the distance of twenty-six miles from our last encampment, we halted for the night. We had scarcely encamped, when three young men from the Walla-walla village came in with a steel-trap, which we had inadvertently left behind, and which they had come a whole day's journey on purpose to restore. This act of integrity was the more pleasing because it corresponds perfectly with the general behavior of the Walla-wallas, among whom we had lost carelessly several knives, which were always returned as soon as found. We may, indeed, justly affirm, that, of all the Indians whom we have met, the Walla-wallas were the most hospitable, honest, and sincere. TWISTED-HAIR.