Before the introduction of the horse, the Plains Indians traveled on foot. The tribes living along the Mississippi made some use of canoes, according to early accounts, while those of the Missouri and inland, used only crude tub-like affairs for ferry purpose. When first discovered, the Mandan, Hidatsa, and Arikara had villages on the Missouri, in what is now North Dakota, but they have never been credited with canoes. For crossing the river, they used the bull-boat, a tub-shaped affair made by stretching buffalo skins over a wooden frame; but journeys up and down the bank were made on foot.
Museum collections cannot illustrate this important phase of culture; but since no comprehensive view of the subject can be had without its consideration, we must give it some space. It is customary to treat of all habits or customs having to do with the family organization, the community, and what we call the state, under the head of social organization. So, in order that the reader may form some general idea of social conditions in this area, we shall review some of the discussed points. Unfortunately, the data for many tribes are meager so that a complete review cannot be