In trade, the largest sized beaver skin is called by the French a _plus_, and constitutes the chief standard of value. Thus as many of any other description of skins as are considered of equal value with this large beaver skin, are collectively denominated a _plus_; and the number of deer, raccoon, otter, &c. that shall respectively constitute a plus, is settled between the parties, previously to the commencement of the exchanges. Brass kettles are usually exchanged for beaver skins, pound for pound, which weight of the latter is worth about three dollars at St. Louis. The beaver skins are embodied into neat packs by the traders, each weighing one hundred pounds, and consisting of seventy or eighty skins, according to their magnitude. The business of this hunt having terminated with the year, the Omawhaws return to their village, in order to procure a supply of maize from their places of concealment, after which they continue their journey in pursuit of bisons. On this occasion they divide into two parties, one of which ascends the Missouri, and the other the Elkhorn rivers. The party which discovers a herd, gives notice of the fact to the other party, by an especial messenger, and invites them to join in the pursuit of it. This expedition continues until the month of April, when they return to their village, as before stated, loaded with provisions. It is during this expedition that they procure all the skins, of which the bison robes of commerce are made; the animals at this season having their perfect winter dress, the hair and wool of which are long and dense.