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144 yellow, with seven tassels of feather-work hanging from each of them"; and of a fish with alternate scales of gold and silver. Unhappily no such works of art as the two latter have survived. Grijalva describes the getting of gold by picking out the grains from river-sand; the collector storing them in his mouth and later melting them down on the spot in a pottery vessel, blowing up the fire by means of tubes of reed, as in Fig. 23, b. Gold was also washed from river-sand in small troughs, the water being poured on from gourds. This method was employed both on the east coast and in the Zapotec region, but regular mining was practised by the Zapotec and Chinantec, and gold formed a very important article of tribute, both in dust and plates. The goldsmiths of Azcapotzalco were the most famed in the valley; and gold-workers in general were divided into two classes, heaters and casters. In beating, stone hammers were used for the most part, and the workmen were very skilful at overlaying with gold-foil (the spear-thrower shown on Pl. XVII, 1, has been ornamented in this way). Wooden beads overlaid with gold have been found in the Totonac country. Casting was carried out as follows: pounded charcoal was mixed with fine clay, and kneaded out into thin discs, on which the details of the desired ornament were engraved with a copper tool. Wax was then prepared by boiling, mixed with copal to give it firmness, and, after clarifying by means of a filter, was rolled out on a polished stone and applied in small strips to the details of the design. Pounded charcoal in solution was added as a covering, and, over all, a coating of clay, also mixed with charcoal. A rod of wax, coated with clay, was added, to form a connection with the wax model within. The whole was baked, the wax run out and the molten gold poured in. Finally the mould was broken, and the casting rubbed with earth mixed with salt, to give it a good colour, and then polished. Objects so