The burial customs of northern tribes, known to have occupied portions of the effigy mound district, agree so exactly with what we see in the sepulchral tumuli of this district as to justify the conclusion reached by Dr. Lapham, after a long and careful personal study of them, that they are to be attributed to Indians. Some he was rather inclined to ascribe to tribes which had migrated, had been driven off by other tribes, or been incorporated into them previous to the advent of the white race. But he maintained that the subsequent tribes or those found occupying the country "continued the practice of mound-building so far as to erect a circular or conical tumulus over their dead." And he adds significantly, "This practice appears to be a remnant of ancient customs that connects the mound-builders with the present tribes."[12] The evidence in regard to these unstratified mounds appears to lead directly to the conclusion that they are all the work of the Indians found occupying the country at the time it was first visited by whites or of their ancestors. If it is conceded that the small unstratified tumuli are in part the work of these aborigines, there would seem to be no escape from the conclusion that all the burial mounds of this district are to be ascribed to them; for, although there are some two or three types of burial and burial mounds, the gradation from one to the other is so complete as to leave no marked line of distinction, and Dr. Lapham is fully justified in asserting that the evidence connects the mound-builders with the modern Indians. The stratified mounds in which the hard clay or mortar covering over the remains is found, and which we shall again meet with in the adjoining district, may be the work of different tribes from those which constructed the small unstratified tumuli, but the distinctions between the two classes are not such as to justify the belief that they are to be attributed to a different race or to a people occupying a higher or widely different culture-status. Having reached this conclusion it is impossible for us to halt here; we are compelled to take one step farther in the same direction and ascribe the singular structures known as "effigy mounds" to the same people. The two classes of work are too intimately connected to admit of the supposition that the effigy mounds were built by one race or people, and the conical tumuli by another. We might as well assume that the enclosures of Ohio were the work of one people, but the mounds accompanying them of another.