move up and down [the Mississippi] we find repeated changes from one type to another."[1]
The direction from which these mound-builders entered the regions where their works are found, and their migrations within this region, must be decided by a careful study of the varying character of the mounds and a classification of them.
This work has not been done, save in the most general way possible, though one highly important conclusion has been definitely reached. It is that the generally received opinion heretofore held by archæologists that the lines of migration were along the principal water-courses is not found to be correct, and that these lines of migration were across the larger water-courses, such as the Mississippi, rather than up and down them.[2]
"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
