During the few days we remained at Cote Sans Dessein, Dr. Baldwin, though suffering much from weakness, and yielding perceptibly to the progress of a fatal disease, was able to make several excursions on shore. His devotion to a fascinating pursuit stimulated him to exertions for which the strength of his wasted frame seemed wholly inadequate; and it is not, perhaps, improbable that his efforts may have somewhat hastened the termination of his life. Between Loutre Island and Cote Sans Dessein compact limestone occurs, in horizontal strata, along the sides of the Missouri valley. It is of a bluish white colour, compact structure, and a somewhat concoidal fracture, containing few organic remains. It alternates with sandstones, having a silicious cement.[109] These horizontal strata are deeply covered with soil, usually a calcareous loam, intermixed with decayed vegetable matter. July 6th.--Soon after leaving the settlement of Cote Sans Dessein, we passed the upper and larger mouth of the Osage river. Here, to use the language of the country, a town has been _located_, and the lots lately disposed of at St. Louis, at various prices, from fifty to one hundred and eighty dollars each.[110] Within the limits of this town is a considerable hill, rising at the point of the junction of the two rivers, and running parallel to the Missouri. From its summit is an extensive view of the village of Cote Sans Dessein, and the surrounding country. The river of the Osages, so called from the well-known tribe of Indians inhabiting its banks, enters the Missouri one hundred and thirty-three miles above the confluence of the latter river with the Mississippi. Its sources are in the Ozark mountains, opposite those of the White river of the Mississippi, and of the Neosho, {79} a tributary of the Arkansa. Flowing along the base of the north-western slope of a mountainous range, it receives from the east several rapid and beautiful rivers, of which the largest is the Yungar, (so named, in some Indian language, from the great number of springs tributary to it,) entering the Osage one hundred and forty miles from the Missouri. In point of magnitude the Osage ranks nearly with the Cumberland and Tennessee. It has been represented as navigable for six hundred miles; but as its current is known to be rapid, flowing over great numbers of shoals and sand-bars, this must be considered an exaggeration. In the lower part of its course it traverses broad and fertile bottom lands, bearing heavy forests of sycamore and cotton trees. We may expect the country along the banks of this river will soon become the seat of a numerous population, as it possesses in a fertile soil and a mild climate, advantages more than sufficient to compensate for the difficulty of access, and other inconveniences of situation.