1830. Sublette's camp commenced moving back to the east side of the Rocky Mountains in October. Its course was up Henry's fork of the Snake River, through the North Pass to Missouri Lake, in which rises the Madison fork of the Missouri River. The beaver were very plenty on Henry's fork, and our young trapper had great success in making up his packs; having learned the art of setting his traps very readily. The manner in which the trapper takes his game is as follows:-- He has an ordinary steel trap weighing five pounds, attached to a chain five feet long, with a swivel and ring at the end, which plays round what is called the _float_, a dry stick of wood, about six feet long. The trapper wades out into the stream, which is shallow, and cuts with his knife a bed for the trap, five or six inches under water. He then takes the float out the whole length of the chain in the direction of the centre of the stream, and drives it into the mud, so fast that the beaver cannot draw it out; at the same time tying the other end by a thong to the bank. A small stick or twig, dipped in musk or castor, serves for bait, and is placed so as to hang directly above the trap, which is now set. The trapper then throws water plentifully over the adjacent bank to conceal any foot prints or scent by which the beaver would be alarmed, and going to some distance wades out of the stream. In setting a trap, several things are to be observed with care:--first, that the trap is firmly fixed, and the proper distance from the bank--for if the beaver can get on shore with the trap, he will cut off his foot to escape: secondly, that the float is of dry wood, for should it not be, the little animal will cut it off at a stroke, and swimming with the trap to the middle of the dam, be drowned by its weight. In the latter case, when the hunter visits his traps in the morning, he is under the necessity of plunging into the water and swimming out to dive for the missing trap, and his game. Should the morning be frosty and chill, as it very frequently is in the mountains, diving for traps is not the pleasantest exercise. In placing the bait, care must be taken to fix it just where the beaver in reaching it will spring the trap. If the bait-stick be placed high, the hind foot of the beaver will be caught: if low, his fore foot.