The geometrical figures are arranged in the drawers according to analogy of form.
(1) In one drawer there are six circles decreasing in diameter. (Fig. 17.)
Fig. 17.––Set of Six Circles.
(2) In another there is a square, together with five rectangles in which the length is always equal to the side of the square while the breadth gradually decreases. (Fig. 18.)
Fig. 18.––Set of Six Rectangles.