=The Rotunda Color Scheme.=--One can hardly leave this description of the decoration of the Rotunda without a word respecting the general color scheme. Beginning with the brown, red, and yellow marbles at the base, one ends with the pure whites and bright greens and violets of Mr. Blashfield’s final decoration. The difference between these two extremes has been bridged over by the use of harmonizing colors on the walls and in the dome. The Pompeiian red of the alcove walls and the pendentives is suggested by the Numidian marble of the piers. A touch of brown on the wall below the semicircular windows echoes the brown Tennessee base, and the yellow predominant in the alcove arches above derives from the Sienna screens. These last, again, in their lightest portions, strike the key for the “old ivory”--the delicate gray yellow--which, either deeper or lighter, is always the ruling tone of the entablature, the dome, and the sculptural figures in plaster. The coffers of the dome, one will notice by looking closely, are defined by a narrow band of yellow or red--yellow throughout one whole compartment, and red in the next. The former carries up (more markedly than in the ivory-toned stucco) the color of the screens; the latter the color of the piers. The blue ground, moreover, and the yellow stripe create together, whether one will or not, an impression of green upon the eye, because green is compounded of blue and yellow; and the blue and the red, in turn, create an impression of violet, for a similar reason. Thus, the visitor, glancing up to the decorations of the collar, is already prepared for Mr. Blashfield’s two dominating tones. The white is expected as the natural result of a color scheme which has been steadily growing lighter from the beginning, and, after being used in Mr. Blashfield’s painting, it is at last appropriately employed almost solely in the lantern which crowns the whole Rotunda. Finally, considering the room as a whole, it will be noted that the profuse use of gold throughout the dome and lantern is not only legitimately suggested by the Sienna marble, but of itself helps to keep the various colors--in marble or stucco--in what may be called a more complete “state of solution” than would otherwise have been possible. By attracting attention to itself, it softens the contrasts between the other colors. The floor of the Rotunda is a kind of mosaic, known as _terrazzo_, ornamented with great concentric bands of Tennessee marble. _Terrazzo_, sometimes called “chip mosaic” or “granito,” is made by sprinkling a layer of small pieces of marble upon a bed of Portland cement, rolling it all down so that the pieces are thoroughly embedded, and, after it is dry, rubbing it down smooth with sandstone. When carefully prepared, it makes an especially durable floor. [Illustration: NEWTON. BY C. E. DALLIN.]