At night almost incessant lightning coruscated in the north-western horizon. Wednesday, 16th. Several showers of rain, with much thunder and vivid lightning, fell during the {80} night, and the early morning continued showery; but the clouds were evidently undergoing the change from nimbus to cirrostratus, in this instance the harbingers of a fine day. Several ravines occurred on the morning's journey, containing, in the deeper parts of their beds, pools of standing water. The first was of considerable size, with steep banks, and thickly wooded, as far up its course as the vision extended; the trees were principally oak, some walnut, elm, ash, mulberry, button-wood, cotton-wood, and willow. A horse presented by the Kiawa chief could not be prevailed upon to traverse this occasional watercourse; he evaded the attempts of several men to urge him forward; and after being thus fruitlessly detained a considerable space of time, the animal was shot. If he had been abandoned, he must have perished for want of water, having been accidentally deprived of sight, and more certainly, as that fluid, so indispensable for the support of the animal's life, was here of difficult access. At the ravine, which served as a halting place during the mid-day heats, we first observed the plant familiarly known in the settlements by the name of _poke_ (phytolacca decandria), reclining over the banks with its fecundity, in the midst of a crowded assemblage of bushes, and partially shading a limpid pool that mantled a rocky bed below. A large species of mushroom, of the puff-ball kind, was not uncommon, nearly equal in size to a man's head. We have now passed the boundary of the summer bison range; and the wolves, those invariable attendants on that animal, are now but rarely seen. The antelopes also have disappeared. The river banks, as well as the creeks and some ravines, from near the Little Arkansa, are pretty well wooded, with but few interruptions, and in many parts sufficiently dense, but always, as yet, strictly limited to skirting those watercourses. {81} During the afternoon we crossed numerous ravines, some of which, judging by the infallible indications of dried grass and floated wood lodged on high in the crotches of the trees, poured down at certain seasons large volumes of water from the prairies into the river. Near our evening encampment, but on the opposite side of the river, appeared the entrance of a large creek, of the width of 90 or 100 yards, and of considerable depth; it seems to be well wooded, and its course is nearly parallel to the river for a great distance before it discharges into it. This stream is called Red river fork, its waters are turbid, opaque, and red;[114] great numbers of fresh water tortoises, closely allied to the testudo geographica of Le Sueur, inhabit the basin formed by the entrance of this stream immediately below its junction. The bluffs on that side are washed by the stream of the river.