2 was occupied by Four Bears." The list includes fifteen names. At the time the survey was made the entire ditch could not be traced, but its general course could be followed, thus indicating the approximate boundary of the town, "beyond which only a few tepees are located." (Libby, (1), pp. 498-499.) [Illustration: FIG. 10.--Plan of the Mandan village at Fort Clark.] When it is realized how little is known regarding the arrangement of the many ancient villages which once stood in the country east of the Mississippi, villages which in their time were probably as large and important as those of the Mandan of the last century, it is not possible to overestimate the value of the work of the Historical Society in causing to be made an accurate survey of the sites and in securing descriptions of the villages from some who remember them. A generation later this would not have been possible. HIDATSA GROUP. Two tribes are regarded as constituting this group: The Hidatsa proper, known to the earlier writers as the Minnetarees, and to others as the Gros Ventres of the Missouri; and the Crows. The Hidatsa and the Crows were, until a few generations ago, one people, but trouble developed and the latter moved farther up the Missouri to the Rocky Mountains, and there they were discovered by the early explorers of the region. The Amahami may have been a distinct tribe, and as such were recognized by Lewis and Clark, but according to their own traditions they, together with the Hidatsa and Crows, once formed a single tribe. Their language differs only slightly from that of the Hidatsa. During the early years of the last century their one village stood at the mouth of Knife River. Already greatly reduced in numbers, they suffered during the epidemic of 1837, and later the majority of those who had survived became more closely associated with the Hidatsa. HIDATSA. The Hidatsa, also known as the Minnetarees and designated by some writers the Gros Ventres of the Missouri, a name which must not be confused with Gros Ventres of the Prairie often applied to the Atsina, lived when first known to Europeans near the junction of the Knife and Missouri Rivers, in the eastern part of the present Mercer County, North Dakota. Some are of the belief that it was the Hidatsa and not the Mandan whom the French, under La Verendrye, visited during the autumn and winter of 1738, but in the present sketch the Mandan are accepted as undoubtedly being the tribe at whose villages the French remained.