The conduct of the many Indian tribes with whom they had communication was almost always friendly, and in only one or two cases did even strange Indians from a distance show signs of hostility. The northwest coast had been visited so often that little could be added to the knowledge of their customs and mode of life. One comment of Lewis, is, however, worthy of reproduction. "We have not observed any liquor of an intoxicating quality used among these or any Indians west of the Rocky Mountains, the universal beverage being pure water. They sometimes almost intoxicate themselves by smoking tobacco, of which they are excessively fond, and the pleasure of which they prolong as much as possible by retaining vast quantities at a time, till after circulating through the lungs and stomach, it issues in volumes from the mouth and nostrils." It appears surprising that Lewis was ignorant of the discovery of the Columbia River by Captain Robert Gray, for he says that the name Point Adams was given by Vancouver. Further, he was ignorant of the fact that the trade at the mouth of the Columbia was conducted almost entirely by vessels from New England. From the English phrases of the Indian, he knew that the traders must be "either English or American," and presumed "that they do not belong at any establishment at Nootka Sound." The original plan contemplated remaining at Fort Clatsop until April, when Lewis expected to renew his stock of merchandise from the traders who yearly visited the Columbia by ship. Constant rains, however, increased sickness among his men, while game failed to such an extent that they only lived from hand to mouth; and as merchandise lacked wherewith to buy food from the Indians, it became necessary to return. On departing, he left among the Indians a number of notices setting forth briefly the results of his expedition; one of these, through an American trader, reached Boston via China in February, 1807, about six months after Lewis's own return. On March 24, 1806, the party commenced to retrace their long and dangerous route of 4,144 miles to St. Louis. Their guns were in good order and the stock of ammunition plentiful, but their entire stock of trading goods could be tied up in a single blanket. Detained by scarcity of fish, they discovered the Multonah (Willamette) River which, hidden by an island, was not seen on their downward voyage. Lieutenant Clark went up the valley some distance to Nechecole village, where he saw an Indian house, all under one roof, 226 feet long. Of the valley of the Willamette, Lewis remarks that it was the only desirable place of settlement west of the Rocky Mountains, and it was sufficiently fertile to support 50,000 souls. He mentions its rich prairies, its fish, fowl, and game, its useful plants and shrubs, its abundant and valuable timber.