Monday, 22.  We set out at an early hour.  The river being divided into so many channels by both large and small islands, that it was impossible to lay it down accurately by following in a canoe any single channel, captain Lewis walked on shore, took the general courses of the river, and from the rising grounds laid down the situation of the islands and channels, which he was enabled to do with perfect accuracy, the view not being obstructed by much timber.  At one mile and a quarter we passed an island somewhat larger than the rest, and four miles further reached the upper end of another, on which we breakfasted.  This is a large island forming in the middle of a bend to the north a level fertile plain ten feet above the surface of the water and never overflowed.  Here we found great quantities of a small onion about the size of a musket ball, though some were larger; it is white, crisp, and as well flavoured as any of our garden onions; the seed is just ripening, and as the plant bears a large quantity to the square foot, and stands the rigours of the climate, it will no doubt be an acquisition to settlers.  From this production we called it Onion island.  During the next seven and three quarter miles we passed several long circular bends, and a number of large and small islands which divide the river into many channels, and then reached the mouth of a creek on the north side.  It is composed of three creeks which unite in a handsome valley about four miles before they discharge themselves into the Missouri, where it is about fifteen feet wide and eight feet deep, with clear transparent water.  Here we halted for dinner, but as the canoes took different channels in ascending it was some time before they all joined.  Here we were delighted to find that the Indian woman recognizes the country; she tells us that to this creek her countrymen make excursions to procure a white paint on its banks, and we therefore call it Whiteearth creek.  She says also that the three forks of the Missouri are at no great distance, a piece of intelligence which has cheered the spirits of us all, as we hope soon to reach the head of that river.  This is the warmest day except one we have experienced this summer.  In the shade the mercury stood at 80 degrees above 0, which is the second time it has reached that height during this season.  We encamped on an island after making nineteen and three quarter miles.

In the course of the day we saw many geese, cranes, small birds common to the plains, and a few pheasants:  we also observed a small plover or curlew of a brown colour, about the size of the yellow-legged plover or jack curlew, but of a different species.  It first appeared near the mouth of Smith’s river, but is so shy and vigilant that we were unable to shoot it.  Both the broad and narrow-leafed willow continue, though the sweet willow has become very scarce.  The rosebush, small honeysuckle, the pulpy-leafed thorn, southern wood, sage and box-alder,