On the arrival of Lewis and Clarke at the mouth of the Columbia, in 1806, the new language, from the sentences given by them, had evidently attained some form. It was with the arrival of Astor's party, however, that the Jargon received its principal impulse. Many more words of English were then brought in, and for the first time the French, or rather the Canadian and Missouri patois of the French, was introduced. The principal seat of the company being at Astoria, not only a large addition of Chinook words was made, but a considerable number was taken from the Chihalis, who immediately bordered that tribe on the north,--each owning a portion of Shoalwater Bay. The words adopted from the several languages were, naturally enough, those most easily uttered by all, except, of course, that objects new to the natives found their names in French or English, and such modifications were made in pronunciation as suited tongues accustomed to different sounds. Thus the gutturals of the Indians were softened or dropped; and the _f_ and _r_ of the English and French, to them unpronounceable, were modified into _p_ and _l_. Grammatical forms were reduced to their simplest expression, and variations in mood and tense conveyed only by adverbs or by the context. The language continued to receive additions, and assumed a more distinct and settled meaning, under the Northwest and Hudson's Bay companies, who succeeded Astor's party, as well as through the American settlers in Oregon. Its advantage was soon perceived by the Indians, and the Jargon became to some extent a means of communication between natives of different speech, as well as between them and the whites. It was even used as such between Americans and Canadians. It was at first most in vogue upon the lower Columbia and the Willamette, whence it spread to Puget Sound, and with the extension of trade, found its way far up the coast, as well as the Columbia and Fraser rivers; and there are now few tribes between the 42d and 57th parallels of latitude in which there are not to be found interpreters through its medium. Its prevalence and easy acquisition, while of vast convenience to traders and settlers, has tended greatly to hinder the acquirement of the original Indian languages; so much so, that except by a few missionaries and pioneers, hardly one of them is spoken or understood by white men in all Oregon and Washington Territory. Notwithstanding its apparent poverty in number of words, and the absence of grammatical forms, it possesses much more flexibility and power of expression than might be imagined, and really serves almost every purpose of ordinary intercourse.