The characteristics which appear to warrant us in concluding that the works of this region pertain to a different people from those in the other districts, at the same time seem to show some relation to those of the Ohio district. Such are the numerous stone pipes, the altar-like structures found in some of the mounds, and the presence of mica plates with the skeletons. But the peculiar features are the mode of burial, the absence of pottery, and the numerous polished celts and engraved shells found in the mounds. Although it is probable that there are at least three districts in the southern portion of the United States, they appear to pass from one into the other by such slight changes in the character of the works as to render it exceedingly difficult to fix the boundaries between them. I therefore mention the following, provisionally, as being those indicated by the data so far obtained. (6) The _Middle Mississippi area_ or _Tennessee district_, including southeast Missouri, northern Arkansas, middle and western Tennessee, southern and western Kentucky, and southern Illinois. The works of the Wabash valley possibly belong also to this district, but the data obtained in regard to them are not sufficient to decide this point satisfactorily. This district, like the others of the south, is distinguished from the northern section by its larger mounds, many of which are pyramidal and truncated and often terraced, and which were, beyond question, used as domiciliary mounds. Here we also meet with repeated examples of enclosures though essentially different from those of Ohio; also ditches and canals. From the Lower Mississippi and Gulf districts, with which, as we have said, it is closely allied, it is distinguished chiefly by the presence of the box-shaped stone cists or coffins, by the small circular house-sites or hut-rings, and by the character of the pottery. This is pre-eminently the pottery region, the typical forms being the long-necked, gourd-shaped vase and the image-vessels. In this district the carved stone pipes are much less common than in the Illinois, Ohio, and Appalachian districts.