The character of the country through which we had passed for the last two or three days was cheerless in comparison with that to which we had been accustomed. In general it was more level; the timber being more abundant on the skirts of the stream, with little or none at all in the distance. Wherever bluffs appeared upon the margin we descried indications of coal, and we saw one extensive bed of a thick bituminous nature which very much discolored the water for some hundred yards below it. The current is more gentle than hitherto, the water clearer, and the rocky points and shoals fewer, although such as we had to pass were as difficult as ever. We had rain incessantly, which rendered the banks so slippery that the men who had the towing lines could scarcely walk. The air too was disagreeably chilly, and upon ascending some low hills near the river we observed no small quantity of snow lying in the clefts and ridges. In the extreme distance on our right we had perceived several Indian encampments which had the appearance of being temporary, and had been only lately abandoned. This region gives no indication of any permanent settlement, but appears to be a favorite hunting ground with the tribes in the vicinity — a fact rendered evident by the frequent traces of the hunt, which we came across in every direction. The Minnetarees of the Missouri, it is well known, extend their excursions in pursuit of game as high as the great fork, on the south side; while the Assiniboins go up still higher. Misquash informed us that between our present encampment and the Rocky Mountains we should meet with no lodges except those of the Minnetarees that reside on the lower or south side of the Saskatchawine.

The game had been exceedingly abundant, and in great variety — elk, buffalo, big-horn, mule-deer, bears, foxes, beaver, etc., etc., with wild fowl innumerable. Fish was also plentiful. The width of the stream varied considerably from two hundred and fifty yards to passes where the current rushed between bluffs not more than a hundred feet apart. The face of these bluffs generally was composed of a light yellowish freestone, intermingled with burnt earth, pumice-stone, and mineral salts. At one point the aspect of the country underwent a remarkable change, the hills retiring on both sides to a great distance from the river, which was thickly interspersed with small and beautiful islands, covered with cotton-wood. The low grounds appeared to be very fertile; those on the north wide and low, and opening into three extensive valleys. Here seemed to be the extreme northern termination of the range of mountains through which the Missouri had been passing for so long a time, and which are called the Black Hills by the savages. The change from the mountainous region to the level was indicated by the atmosphere, which now became dry and pure; so much so indeed that we perceived its effects upon the seams of our boats, and our few mathematical instruments.

As we made immediate approach to the forks it came on to rain very hard, and the obstructions in the river were harassing in the extreme. The banks in some places were so slippery, and the clay so soft and stiff that the men were obliged to go barefooted, as they could not keep on their moccasins. The shores also were full of pools of stagnant water, through which we were obliged to wade, sometimes up to our armpits. Then again we had to scramble over enormous shoals of sharp- pointed flints, which appeared to be the wreck of cliffs that had fallen down en masse. Occasionally we came to a precipitous gorge or gully, which it would put us to the greatest labor to pass, and in attempting to push by one of these the rope of the large boat (being old and much worn) gave way and permitted her to be swung round by the current upon a ledge of rock in the middle of the stream, where the water was so deep that we could only work in getting her off by the aid of the piroque, and so were full six hours in effecting it.

At one period we arrived at a high wall of black rock on the south, towering above the ordinary cliffs for about a quarter of a mile along the stream; after which there was an open plain, and about three miles beyond this again, another wall of a light color on the same side, fully two hundred feet high; then another plain or valley, and then still another wall of the most singular appearance arises on the north, soaring in height probably two hundred and fifty feet, and being in thickness about twelve, with a very regular artificial character. These cliffs present indeed the most extraordinary aspect, rising perpendicularly from the water. The last mentioned are composed of very white soft sandstone, which readily receives the impression of the water. In the upper portion of them appears a sort of frieze or cornice formed by the intervention of several thin horizontal strata of a white freestone, hard, and unaffected by the rains. Above them is a dark rich soil, sloping gradually back from the water to the extent of a mile or thereabouts, when other hills spring up abruptly to the height of full five hundred feet more.

The face of these remarkable cliffs, as might be supposed, is chequered with a variety of lines formed by the trickling of the rains upon the soft material, so that a fertile fancy might easily imagine them to be gigantic monuments reared by human art, and carved over with hieroglyphical devices. Sometimes there are complete niches (like those we see for statues in common temples) formed by the dropping out bodily of large fragments of the sandstone; and there are several points where staircases and long corridors appear, as accidental fractures in the freestone cornice happen to let the rain trickle down uniformly upon the softer material below. We passed these singular bluffs in a bright moonlight and their effect upon my imagination I shall never forget. They had all the air of enchanted structures, (such as I have dreamed of,) and the twittering of myriads of martins, which have built their nests in the holes that every where perforate the mass, aided this conception not a little. Besides the main walls there are, at intervals, inferior ones, of from twenty to a hundred feet high, and from one to twelve or fifteen feet thick, perfectly regular in shape, and perpendicular. These are formed of a succession of large black-looking stones, apparently made up of loam, sand, and quartz, and absolutely symmetrical in figure, although of various sizes. They are usually square, but sometimes oblong (always parrallelepipedal) and are lying one above the other as exactly and with as perfect regularity as if placed there by some mortal mason; each upper stone covering and securing the point of junction between two lower ones, just as bricks are laid in a wall. Sometimes these singular erections run in parallel lines, as many as four abreast; sometimes they leave the river and go back until lost amid the hills; sometimes they cross each other at right angles, seeming to enclose large artificial gardens, the vegetation within which is often of a character to preserve the illusion. Where the walls are thinnest, there the bricks are less in size, and the converse. We regarded the scenery presented to our view at this portion of the Missouri as altogether the most surprising, if not the most beautiful which we had yet seen. It left upon my own mind an impression of novelty — of singularity, which can never be effaced.

Shortly before reaching the fork we came to a pretty large island on the northern side, one mile and a quarter from which is a low ground on the south very thickly covered with fine timber. After this there were several small islands, at each of which we touched for a few minutes as we passed. Then we came to a very black-looking bluff on the north, and then to two other small islands, about which we observed nothing remarkable. Going a few miles farther we reached a tolerably large island situated near the point of a steep promontory; afterwards passing two others, smaller. All these islands are well timbered. It was at night on the 13th of May, that we were shown by Misquash the mouth of the large river, which in the settlements goes by the name of the Yellow Stone, but by the Indians is called the Ahmateaza. We made our camp on the south shore in a beautiful plain covered with cotton-wood.

May 14. This morning we were all awake and stirring at an early hour, as the point we had now reached was one of great importance, and it was requisite that, before proceeding any farther, we should make some survey by way of ascertaining which of the two large streams in view would afford us the best passage onward. It seemed to be the general wish of the party to push up one of these rivers as far as practicable, with a view of reaching the Rocky Mountains, when we might perhaps hit upon the head waters of the large stream Aregan, described by all the Indians with whom we had conversed upon the subject, as running into the great Pacific Ocean. I was also anxious to attain this object, which opened to my fancy a world of exciting adventure, but I foresaw many difficulties which we must necessarily encounter if we made the attempt with our present limited information in respect to the region we should have to traverse, and the savages who occupied it; about which latter we only knew indeed that they were generally the most ferocious of the North American Indians. I was afraid, too, that we might get into the wrong stream, and involve ourselves in an endless labyrinth of troubles which would dishearten the men. These thoughts, however, did not give me any long uneasiness, and I set to work at once to explore the neighborhood; sending some of the party up the banks of each stream to estimate the comparative volume of water in each, while I myself, with Thornton and John Greely, proceeded to ascend the high grounds in the fork, whence an extensive prospect of the surrounding region might be attained. We saw here an immense and magnificent country spreading out on every side into a vast plain, waving with glorious verdure, and alive with countless herds of buffaloes and wolves, intermingled with occasional elk and antelope. To the south the prospect was interrupted by a range of high, snow-capped mountains, stretching from south east to north west, and terminating abruptly. Behind these again was a higher range, extending to the very horizon in the north west. The two rivers presented the most enchanting appearance as they wound away their long snake-like lengths in the distance, growing thinner and thinner until they looked like mere faint threads of silver as they vanished in the shadowy mists of the sky. We could glean nothing, from their direction so far, as regards their ultimate course, and so descended from our position much at a loss what to do.

The examination of the two currents gave us but little more satisfaction. The north stream was found to be the deeper, but the south was the wider, and the volume of water differed but little. The first had all the color of the Missouri, but the latter had the peculiar round gravelly bed which distinguishes a river that issues from a mountainous region. We were finally determined by the easier navigation of the north branch to pursue this course, although from the rapidly increasing shallowness we found that in a few days, at farthest, we should have to dispense with the large boat. We spent three days at our encampment, during which we collected a great many fine skins, and deposited them with our whole stock on hand, in a well constructed cache on a small island in the river a mile below the junction. We also brought in a great quantity of game, and especially of deer, some haunches of which we pickled or corned for future use. We found great abundance of the prickly pear in this vicinity, as well as chokeberries in great plenty upon the low grounds and ravines. There were also many yellow and red currants (not ripe) with gooseberries. Wild roses were just beginning to open their buds in the most wonderful profusion. We left our encampment in fine spirits on the morning of

May 18. The day was pleasant, and we proceeded merrily, notwithstanding the consistent interruptions occasioned by the shoals and jutting points with which the stream abounds. The men, one and all, were enthusiastic in their determination to persevere, and the Rocky Mountains were the sole theme of conversation. In leaving our peltries behind us, we had considerably lightened the boats, and we found much less difficulty in getting them forward through the rapid currents than would otherwise have been the case. The river was crowded with islands, at nearly all of which we touched. At night we reached a deserted Indian encampment, near bluffs of a blackish clay. Rattlesnakes disturbed us very much, and before morning we had a heavy rain.

May 19. We had not proceeded far before we found the character of the stream materially altered, and very much obstructed by sand bars, or rather ridges of small stones, so that it was with the greatest difficulty we could force a passage for the larger boat. Sending two men ahead to reconnoitre, they returned with an account of a wider and deeper channel above, and once again we felt encouraged to persevere. We pushed on for ten miles and encamped on a small island for the night. We observed a peculiar mountain in the distance to the south, of a conical form, isolated, and entirely covered with snow.

May 20. We now entered into a better channel, and pursued our course with little interruption for sixteen miles, through a clayey country of peculiar character, and nearly destitute of vegetation. At night we encamped on a very large island, covered with tall trees, many of which were new to us. We remained at this spot for five days to make some repairs in the piroque.

During our sojourn here an incident of note occurred. The banks of the Missouri in this neighborhood arc precipitous, and formed of a peculiar blue clay, which becomes excessively slippery after rain. The cliffs, from the bed of the stream back to the distance of a hundred yards, or thereabouts, form a succession of steep terraces of this clay, intersected in numerous directions by deep and narrow ravines, so sharply worn by the action of water at some remote period of time as to have the appearance of artificial channels. The mouths of these ravines, where they debouche upon the river, have a very remarkable appearance, and look from the opposite bank, by moonlight, like gigantic columns standing erect upon the shore. To an observer from the uppermost terrace the whole descent towards the stream has an indescribably chaotic and dreary air. No vegetation of any kind is seen.

John Greely, the Prophet, the interpreter Jules, and myself started out after breakfast one morning to ascend to the topmost terrace on the south shore for the purpose of looking around us; in short to see what could be seen. With great labor, and by using scrupulous caution, we succeeded in reaching the level grounds at the summit opposite our encampment. The prairie here differs from the general character of that kind of land in being thickly overgrown for many miles back with cotton- wood, rose-bushes, red willow, and broad-leaved willow; the soil being unsteady, and at times swampy, like that of the ordinary low grounds — it consists of a black-looking loam, one-third sand, and when a handful of it is thrown into water, it dissolves in the manner of sugar, with strong bubbles. In several spots we observed deep incrustations of common salt, some of which we collected and used.

Upon reaching these level grounds we all sat down to rest, and had scarcely done so when we were alarmed by a loud growl immediately in our rear, proceeding from the thick underwood. We started to our feet at once in great terror, for we had left our rifles at the island, that we might be unincumbered in the scramble up the cliffs, and the only arms we had were pistols and knives. We had scarcely time to say a word to each other before two enormous brown bears (the first we had yet encountered during the voyage) came rushing at us open-mouthed from a clump of rose-bushes. These animals are much dreaded by the Indians, and with reason, for they are indeed formidable creatures, possessing prodigious strength, with untameable ferocity, and the most wonderful tenacity of life. There is scarcely any way of killing them by a bullet, unless the shot be through the brains, and these are defended by two large muscles covering the side of the forehead, as well as by a projection of a thick frontal bone. They have been known to live for days with half a dozen balls through the lungs, and even with very severe injuries in the heart. So far we had never met with a brown bear, although often with its tracks in the mud or sand, and these we had seen nearly a foot in length, exclusive of the claws, and full eight inches in width.

What to do was now the question. To stand and fight, with such weapons as we possessed, was madness; and it was folly to think of escape by flight in the direction of the prairie; for not only were the bears running towards us from that quarter, but, at a very short distance back from the cliffs, the underwood of briar-bushes, dwarf willow, etc., was so thick that we could not have made our way through it at all, and if we kept our course along the river between the underwood and the top of the cliff, the animals would catch us in an instant; for as the ground was boggy we could make no progress upon it, while the large flat foot of the bear would enable him to travel with ease. It seemed as if these reflections (which it takes some time to embody in words) flashed all of them through the minds of all of us in an instant — for every man sprang at once to the cliffs, without sufficiently thinking of the hazard that lay there.

The first descent was some thirty or forty feet, and not very precipitous; the clay here also partook in a slight degree of the loam of the upper soil; so that we scrambled down with no great difficulty to the first terrace, the bears plunging after us with headlong fury. Arrived here, we had not a moment for hesitation. There was nothing left for us now but to encounter the enraged beasts upon the narrow platform where we stood, or to go over the second precipice. This was nearly perpendicular, sixty or seventy feet deep, and composed entirely of the blue clay which was now saturated with late rains, and as slippery as glass itself. The Canadian, frightened out of his senses, leaped to the edge at once, slid with the greatest velocity down the cliff, and was hurled over the third descent by the impetus of his course. We then lost sight of him, and of course supposed him killed; for we could have no doubt that his terrific slide would be continued from precipice to precipice until it terminated with a plunge over the last into the river — a fall of more than a hundred and fifty feet.

Had Jules not gone in this way it is more than probable that we should all have decided, in our extremity, upon attempting the descent; but his fate caused us to waver, and in the meantime the monsters were upon us. This was the first time in all my life I had ever been brought to close quarters with a wild animal of any strength or ferocity, and I have no scruple to acknowledge that my nerves were completely unstrung. For some moments I felt as if about to swoon, but a loud scream from Greely, who had been seized by the foremost bear, had the effect of arousing me to exertion, and when once fairly aroused I experienced a kind of wild and savage pleasure from the conflict.

One of the beasts, upon reaching the narrow ledge where we stood, had made an immediate rush at Greely, and had borne him to the earth, where he stood over him, holding him with his huge teeth lodged in the breast of his overcoat — which, by the greatest good fortune, he had worn, the wind being chilly. The other, rolling rather than scrambling down the cliff, was under so much headway when he reached our station that he could not stop himself until the one-half of his body hung over the precipice; he staggered in a sidelong manner, and his right legs went over while he held on in an awkward way with his two left. While thus situated he seized Wormley by the heel with his mouth, and for an instant I feared the worst, for in his efforts to free himself from the grasp the terrified struggler aided the bear to regain his footing. While I stood helpless, as above described, through terror, and watching the event without ability to render the slightest aid, the shoe and moccasin of W. were torn off in the grasp of the animal, who now tumbled headlong down to the next terrace, but stopped himself, by means of his huge claws, from sliding farther. It was now that Greely screamed for aid, and the Prophet and myself rushed to his assistance. We both fired our pistols at the bear's head; and my own ball, I am sure, must have gone through some portion of his skull, for I held the weapon close to his ear. He seemed more angry, however, than hurt; the only good effect of the discharge was in his quitting his hold of Greely (who had sustained no injury) and making at us. We had nothing but our knives to depend upon, and even the refuge of the terrace below was cut off from us by the presence of another bear there. We had our backs to the cliff, and were preparing for a deadly contest, not dreaming of help from Greely (whom we supposed mortally injured) when we heard a shot, and the huge beast fell at our feet, just when we felt his hot and horribly fetid breath in our faces. Our deliverer, who had fought many a bear in his life-time, had put his pistol deliberately to the eye of the monster, and the contents had entered the brain.

Looking now downwards, we discovered the fallen bruin making ineffectual efforts to scramble up to us — the soft clay yielded to his claws, and he fell repeatedly and heavily. We tried him with several shots, but did no harm, and resolved to leave him where he was for the crows. I do not see how he could ever have made his escape from the spot. We crawled along the ledge on which we stood for nearly half a mile before we found a practicable path to the prairie above us, and did not get to camp until late in the night. Jules was there all alive, but cruelly bruised — so much so indeed that he had been unable to give any intelligible account of his accident or of our whereabouts. He had lodged in one of the ravines upon the third terrace, and had made his way down its bed to the river shore.