in kind, and are not other or greater than might easily arise from local adaptation of an imported invention. Compare the Navajo spindle (pl. 22) with that from Wurtemburg, Germany (fig. 356), and these with the spindles and whorls from Peru (pl. 23). These facts are entirely in harmony with the possibility that the spindle and whorl, as a machine for spinning, was a single invention, and that its slight differentiations resulted from its employment by different peoples--the result of its intertribal migrations. For purposes of comparison, and to show the similarity of these objects in Europe, the author has introduced a series of spindle-whorls from Troy, Hissarlik (pls. 24 and 25). These belong to the U. S. National Museum, and form part of the valuable collection from Mme. Schliemann, the gift by her talented husband to the people of the United States as a token of his remembrance and grateful feelings toward them. [Illustration: PLATE 24. SELECTED SPECIMENS OF SPINDLE-WHORLS FROM THE THIRD, FOURTH, AND FIFTH CITIES OF TROY. U. S. National Museum.] [Illustration: PLATE 25. SELECTED SPECIMENS OF SPINDLE-WHORLS FROM THE THIRD, FOURTH, AND FIFTH CITIES OF TROY. U. S. National Museum.] BOBBINS. EUROPE. We have already seen how an increase in the number of correspondences between objects from distant countries increases the weight of their evidence in favor of contact or communication between the peoples. If it should be found upon comparison that the bobbins on which thread is to be wound, as well as the spindle-whorls with which it is made, had been in use during prehistoric times in the two hemispheres, it would add to the evidence of contact or communication. The U. S. National Museum possesses a series of these bobbins, as they are believed to have been, running from large to small, comprising about one dozen specimens from Italy, one from Corneto and the others from Bologna, in which places many prehistoric spindle whorls have been found (figs. 367 and 368). These are of the type Villanova. The end as well as the side view is represented. The former is one of the largest, the latter of middle size, with others smaller forming a graduating series. The latter is engraved on the end by dotted incisions in three parallel lines arranged in the form of a Greek cross. A similar bobbin from Bologna bears the sign of the Swastika on its end (fig. 193).[314] It was found by Count Gozzadini and forms part of his collection in Bologna. [Illustration: Fig. 367. BOBBIN OR SPOOL FOR WINDING THREAD (?). Type Villanova. Corneto, Italy. U. S. National Museum.] [Illustration: Fig. 368. TERRA-COTTA BOBBIN OR SPOOL FOR WINDING THREAD (?). Type Villanova. Bologna, Italy. Cat. No. 101771, U. S. N. M.] UNITED STATES.