Judging by all the data so far obtained relating to the form, internal structure, and contents of these works, much of which has not yet been published, we are perhaps warranted in concluding that the following districts or areas were occupied by different peoples or tribes. As a matter of course we can only designate these areas in general terms. (1) The _Wisconsin district_, or area of the emblematic or effigy mounds. This embraces the southern half of Wisconsin, a small portion of the northern part of Illinois, and the extreme northeast corner of Iowa. The effigy or animal mounds form the distinguishing feature of the works of this district, but aside from these there are other features sufficient to separate the works of this section from those further south. (2) The _Illinois_ or _Upper Mississippi district_, embracing eastern Iowa, northeastern Missouri, and northern and central Illinois, as far south as the mouth of the Illinois River. In this region the works are mostly simple conical tumuli of small or moderate size, found on the uplands, ridges, and bluffs as well as on the bottoms, and were evidently intended chiefly as depositories of the dead. They are further characterized by internal rude stone and wooden vaults or layers; by the scarcity of pottery vessels, the frequent occurrence of pipes, the presence of copper axes, and often a hard, mortar-like layer over the primary or original burial. The skeletons found are usually extended, though frequently in a sitting or squatting posture. Walls and enclosures are of rare occurrence in this region. (3) The _Ohio district_, including the State of Ohio, the western part of West Virginia, and the eastern portion of Indiana. Although the works of this region present some features which are common to those of the Gulf section, there are several peculiar characteristics which warrant us in designating it as a distinct district. Among other of these peculiar features we notice the great circles and squares of the enclosures, the long parallel lines of earthen walls, the so-called "altar mounds," or mounds containing structures chiefly of clay to which the name "altar" has been applied; the numerous carved stone pipes; the character of the pottery and the methods of burial. (4) The _New York district_, confined chiefly to the northern and western parts of the State of New York, but including also the lake region of the central portion. As the antiquities of this district have been shown by Squier to be chiefly due to the Indian tribes occupying that section at the time of its discovery by the Europeans, it is unnecessary to note the distinguishing characteristics. The works are chiefly enclosing walls, remains of palisades, and burial mounds. (5) The _Appalachian district_, including western North Carolina, eastern Tennessee, southwestern Virginia, and part of southeastern Kentucky.