(7) The _Lower Mississippi district_, including the southern half of Arkansas, Louisiana, and Mississippi. There are no marked characteristics by which to distinguish it from the Middle district; in fact as we move southward along the Mississippi from the mouth of the Illinois river, the works and their contents indicate a succession of tribes differing but slightly in habits, customs, and modes of life, the river generally forming one natural boundary between them, but the other boundaries being arbitrary. For example, the Cahokia region appears to have been the home of a tribe from which at one time a colony pushed northward and settled for a while in Brown and Pike Counties, Illinois. The extreme southeastern counties of Missouri were probably the seat of another populous tribe which extended its borders into the western part of southern Illinois and slightly into northeast Arkansas, and closely resembled in customs and art the ancient people who occupied that part of the Cumberland valley in middle Tennessee. This subsection is principally distinguished by the presence of the small circular house-sites, which are slightly basin-shaped, with a low ring of earth around them. As we move farther southward into Arkansas the house-sites change into low circular mounds, usually from 1 to 3 feet in height, and in nearly every instance containing a layer of clay (often burned) and ashes. These small mounds, which are clearly shown to have been house-sites, were also burial places. It appears to have been a very common custom in this section to bury the dead in the floor, burn the dwelling over them, and cover the whole with dirt, the last operation often taking place while the embers were yet smouldering. Burial in graves was also practiced to a considerable extent. As we approach the Arkansas River, moving southward and from thence into Louisiana, the pottery shows a decided improvement in character and ornamentation. (8) The _Gulf district_, including the Gulf States east of the Mississippi. The works of this section appear to be closely allied to those of the Lower Mississippi district, as here we also find the large flat-topped pyramidal mounds, enclosing walls, and surrounding ditches and canals. The chief differences are to be found in the forms and ornamentation of the pottery and modes of burial. As we approach the Mississippi River the distinguishing features gradually disappear, although there appears to be a distinct subdistrict in the northern part of Mississippi, and as we enter the Florida peninsula a change is observed which appears to indicate a different people, but the data so far obtained are not sufficient to enable us to outline the subdistricts.