Considerable knowledge of the fabrics of the ancient North American tribes is preserved in a way wholly distinct from the preceding. The primitive potter employed woven textiles in the manufacture of earthenware; during the processes of construction the fabrics were impressed on the soft clay, and when the vessels were baked the impressions became fixed. The study of these impressions led to meager results until the idea was conceived of taking castings from them in clay, wax, or paper; through this device the negative impression becomes a positive reproduction and the fabrics are shown in relief, every feature coming out with surprising distinctness; it is possible even to discover the nature of the threads employed and to detect the manner of their combination. Evidence of the practice of textile arts by many ancient nations is preserved to us by such implements of weaving as happened to be of enduring materials; spindle-whorls in clay and stone are perhaps the most common of these relics. These objects tell us definitely of the practice of the art, but give little insight into the character of the products. It is a notable fact that evidence of this class is almost wholly wanting in the United States; spindle-whorls have in rare cases been reported from southern localities, and a few writers have mentioned their use by modern tribes. It happens that in some cases we may learn something of the progress made by vanished peoples in this art by a study of the forms of such of their earthen vessels as were manifestly derived from baskets, or made in imitation of them. The ornamental art of peoples well advanced in culture often bears evidence of the influence of the system of combination of parts followed originally in the textile arts, and little art, ancient or modern, in which men have endeavored to embody beauty, is without strongly marked traces of this influence. By the study of archaic ornament embodied in clay, wood, and stone, therefore, the archeologist may hope to add something to the sum of his knowledge of ancient textiles. It should be noted that the pottery of the mound-builders shows less evidence of the influence of textile forms than does that of most other nations, and some groups of their ware appear to present no recognizable traces of it whatever. Although much information has been brought together from all of the sources mentioned, it is not at all certain that we can form anything like a complete or correct notion of the character and scope of the art as practiced by the mound-builders. No doubt the finest articles of apparel were often buried with the dead, but a very small fraction only of the mortuary wrappings or costumes has been preserved, and from vast areas once thickly inhabited by the most advanced tribes nothing whatever has been collected. Of embroideries, featherwork, and the like, so frequently mentioned by early travelers, hardly a trace is left.