The implement given in Fig. 15 may be taken as a type of a large class of beautifully finished celts. It also is made of the dark tufa, very fine grained and compact, resembling slate. The beveled surfaces of the blade are well polished, the remainder of the surface being evenly picked. The hexagonal section is characteristic of the class, but it is not so decided in this as in some other pieces in which the whole surface is freshly ground. The contraction of the lateral outline and the sudden expansion on reaching the cutting edge noticed in this specimen are more clearly marked in other examples. The small celt shown in Fig. 16 is narrow above and quite wide toward the edge. A wide, thick specimen is given in Fig. 17. A specimen quite exceptional in Chiriqui is shown in Fig. 18. Mr. McNiel states that in many years’ exploration this is the only piece seen that exhibits the constriction of outline characteristic of grooved axes. [Illustration: Fig. 15. Celt of hexagonal section made of dark compact tufa--½.] [Illustration: Fig. 16. Small wide bladed celt made of dark tufa--½.] [Illustration: Fig. 17. Celt with heavy shaft made of dark speckled tufa--½.] [Illustration: Fig. 18. Celt or ax with constriction near the top.] [Illustration: Fig. 19. Flaked and partially polished celt of dark tufa--½.] [Illustration: Fig. 20. Well polished celt of dark tufa--½.] Two superb implements are illustrated in Figs. 19 and 20, the one in the rough excepting at the cutting edge, where it is ground into the desired shape, and the other neatly polished over nearly the entire surface. The surfaces are somewhat whitened from decomposition, but within the rock is nearly black, and the eye could not distinguish it from a dark slate. The material is shown by microscopic test to be a volcanic tufa. These examples were evidently intended for more delicate work than the preceding. The shapes of the specimens illustrated in Figs. 21 and 22 indicate a still different use. The upper end of the implement is large and rough, as if intended to facilitate holding or hafting, while the shaft diminishes in size below, terminating in a narrow, symmetrical, highly polished edge, a shape well calculated to unite delicacy and strength. The highest mechanical skill could hardly give to stone shapes more perfectly adapted to the manipulation of stone, metal, or other hard or compact substances. The material is a very dark, compact, fine grained tufa. [Illustration: Fig. 21. Narrow pointed celt of dark tufa--½.] [Illustration: Fig. 22. Narrow pointed celt of dark tufa--½.] [Illustration: Fig. 23. Cylindrical celt with narrow point, of dark tufa--½.] [Illustration: Fig. 24. Leaf shaped objects suggesting spearpoints, of dark tufa--½.]