I recollect to have seen on my way up the river, at the distance of six or eight hundred miles below, a place called “the Square Hills,” and another denominated “the Bijou Hills;” which are the only features on the river, seeming to correspond with this strange _remain_, and which, on my way down, I shall carefully examine; and not fail to add their testimonies (if I am not mistaken in their character) to further speculations on this interesting feature of the geology of the great valley of the Missouri. Whilst my men were yet engaged in their sporting excursions, I left my easel and travelled to the base and summit of these tabular hills; which, to my great surprise, I found to be several miles from the river, and a severe journey to accomplish getting back to our encampment at nightfall. I found by their sides that they were evidently of an alluvial deposite, composed of a great variety of horizontal layers of clays of different colours—of granitic sand and pebbles (many of which furnished me beautiful specimens of agate, jasper and carnelians), and here and there large fragments of pumice and cinders, which gave, as instances above-mentioned, evidences of volcanic remains. The mode by which Bogard and Ba’tiste had been entrapping the timid and sagacious antelopes was one which is frequently and successfully practised in this country; and on this day had afforded them fine sport. The antelope of this country, I believe to be different from all other known varieties, and forms one of the most pleasing, living ornaments to this western world. They are seen in some places in great numbers sporting and playing about the hills and dales; and often, in flocks of fifty or a hundred, will follow the boat of the descending voyageur, or the travelling caravan, for hours together; keeping off at a safe distance, on the right or left, galloping up and down the hills, snuffing their noses and stamping their feet; as if they were endeavouring to remind the traveller of the wicked trespass he was making on their own hallowed ground. This little animal seems to be endowed, like many other gentle and sweet-breathing creatures, with an undue share of curiosity, which often leads them to destruction; and the hunter who wishes to entrap them, saves himself the trouble of travelling after them. When he has been discovered, he has only to elevate above the tops of the grass, his red or yellow handkerchief on the end of his gun-rod (+plate+ 40), which he sticks in the ground, and to which they are sure to advance, though with great coyness and caution; whilst he lies close, at a little distance, with his rifle in hand; when it is quite an easy matter to make sure of two or three at a shot, which he gets in range of his eye, to be pierced with one bullet.