This famous stream was then regarded as a sort of boundary line between the known and unknown regions.

As mariners crossing the equator require all their comrades, who have not been "over the line" to submit to lathering and shaving, so the Western voyageurs merrily compelled their mates to submit to similar horse-play.

The great river was also the mark above which explorers entered upon what was called the Upper Missouri.
The expedition was now advancing into a region inhabited by several wandering tribes of Indians, chief of which were the Ottoes, Missouris, and Pawnees.

It was determined, therefore, to call a council of some of the chiefs of these bands and make terms of peace with them.

After some delay, the messengers sent out to them brought in fourteen representative Indians, to whom the white men made presents of roast meat, pork, flour, and corn-meal, in return for which their visitors brought them quantities of delicious watermelons.