On the left a large room is devoted to the office, to the reception of new specimens, and to the library, which is intended to include only works pertaining to this special study. On the right opens the room where naturally and properly begins our survey of the museum. Like the other apartments, it occupies the whole of one side of the building, and is about thirty-five by forty feet in dimensions. Its ceiling is twenty-two feet in height, but a broad gallery runs around all four sides, which adds almost as much exhibition-space as would a second story, without spoiling the open and well-lighted effect of a lofty room. Glass cases cover the walls above and below; upon the floor stand combined upright and table cases, resting upon long cabinets of interchangeable drawers, and the gallery-rail supports a line of narrow, flat cases. In each room is a fireplace, while all are well heated in winter and comfortably ventilated in summer, so that they are attractive to visitors. This first room holds what is regarded by the curator as the most important series of objects ever brought together illustrative of that ancient people who built the mounds and the singular stone graves of the southern and central portions of the United States. The contents of each mound and grave are arranged by themselves, so that as one passes from case to case a picture of the human life of the past is presented as nearly perfect as can be constructed out of that part of the handiwork of the people which has escaped decay. Here can be seen and studied the many singular results of the potter's art, simple and complex in form and varied in style of ornament; carvings in stone, shell, and bone; implements and ornaments of stone, shell, bone, mica, clay, copper, and other substances; fragments of cloth and twine twisted from vegetable fibres, which have been preserved through charring. One case in this room is devoted to a collection of objects from caves in Kentucky and Tennessee, and contains many interesting fabrics, including a large piece of cloth woven from bark-fibre, shoes formed by braiding leaves of the cat-tail rush, and many other things kept for us in the dry air of the caves through uncounted centuries. In the gallery are grouped several collections from Mexico and Central America, which are especially rich in pottery.