During
his stay among the Mandans he had been able to lay down the Missouri
according to courses and distances taken on his passage up it, corrected
by frequent observations of longitude and latitude, and to add to the
actual survey of this portion of the river a general map of the country
between the Mississippi and Pacific from the thirty-fourth to the
fifty-fourth degree of latitude. These additions are from information
collected from Indians with whom he had opportunities of communicating
during his journey and residence with them. Copies of this map are now
presented to both Houses of Congress. With these I communicate also a
statistical view, procured and forwarded by him, of the Indian nations
inhabiting the Territory of Louisiana and the countries adjacent to
its northern and western borders, of their commerce, and of other
interesting circumstances respecting them.
In order to render the statement as complete as may be of the Indians
inhabiting the country west of the Mississippi, I add Dr. Sibley's
account of those residing in and adjacent to the Territory of Orleans.
I communicate also, from the same person, an account of the Red River,
according to the best information he had been able to collect.
Having been disappointed, after considerable preparation, in the purpose
of sending an exploring party up that river in the summer of 1804, it
was thought best to employ the autumn of that year in procuring a
knowledge of an interesting branch of the river called the Washita.
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