"One somewhat singular feature is found in the lines of former occupancy indicated by the archæological remains. The chief one is that reaching from New York through Ohio along the Ohio river and onward in the same direction to the northeastern corner of Texas; another follows the Mississippi river; another extends from the region of the Wabash to the headwaters of the Savannah river, and another across southern Michigan and southern Wisconsin. The inference, however, which might be drawn from this fact--that these lines indicate routes of migration--is not to be taken for granted. It is shown by the explorations of the Bureau, and a careful study of the different types of mounds and other works, that the generally received opinion that the lines of migration of the authors of these works were always along the principal water-courses, cannot be accepted as entirely correct. Although the banks of the Mississippi are lined with prehistoric monuments from Lake Pepin to the mouth of Red river, showing that this was a favorite section for the ancient inhabitants, the study of these remains does not give support to the theory that this great water highway was a line of migration during the mound-building period, except for short distances. It was, no doubt, a highway for traffic and war parties, but the movements of tribes were across it rather than up and down it. This is not asserted as a mere theory or simple deduction, but as a fact proved by the mounds themselves, whatever may be the theory in regard to their origin or uses."[90] It is for future scholarship to point out to us the origin, movements, and destiny of this earliest race after a careful comparative study of the remains which contain all we know of them. But may we not believe that the great watersheds were to them what they have been for every other race which has occupied this land? We submit: the greater watersheds should be carefully considered in connection with the study and classification of the various kinds of prehistoric remains with a view to solving the question of the movements of the mound-building Indians in America. The purpose of the first part of this monograph has been accomplished by pointing out some reasons for the belief that these early people opened the first landward passage-ways of the continent on these watersheds. These may be summed up as follows: (1). The mound-building Indians, like the later Indians, were partial to interior locations; some of their greatest forts and most remarkable mounds are found beside our smaller streams. (2). These works are scattered widely over such regions; if there was any communication it must have been on the watersheds, land travel here always having been most expeditious and practicable through all historic times.