As primitive peoples advance in culture and the various branches of art are differentiated, each of the materials employed is made to fill a wider and wider sphere of usefulness. Clay, applied at first to vessel making and used perhaps as an auxiliary in a number of arts in which it took no definite or individual shapes, gradually extended its dominion until almost every art was in a measure dependent upon it or in some way utilized it. The extent of this expansion of availability is in a general way a measure of the advancement of the races concerned. The Chiriquians employed clay in the construction of textile machinery, as shown by the occurrence of spindle whorls, and a number of small receptacles, probably needlecases, are constructed of that material. It was employed in the manufacture of stools, statuettes, drums, rattles, and whistles. With less cultured races, such as the Pueblo and mound builders of the north, such articles were rarely manufactured, while with the more cultured nations of Mexico and Peru a wider field was covered and the work was considerably superior. SPINDLE WHORLS. The art of weaving was carried to a high degree of perfection by many of the American races, but the processes employed were of the simplest kind. The threads were spun upon wooden spindles weighted with whorls of baked clay. These whorls are not plentiful in the graves of Chiriqui, but such as have been collected are quite similar in style to those of Mexico and Peru. In Figs. 218, 219, and 220 we have three examples modeled with considerable attention to detail but comparatively rude in finish. They are in the natural color of the baked clay and are but rudely polished. The first is encircled by a line of rough, indented nodes, the second is embellished with homely little animal figures, and the third with incised patterns and rude incisions. [Illustration: Fig. 218. Spindle whorl in gray clay decorated with annular nodes--1/1.] [Illustration: Fig. 219. Spindle whorl of gray clay with animal figures--1/1.] [Illustration: Fig. 220. Spindle whorl of dark clay with perforations and incised ornament--1/1.] NEEDLECASES (?).