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inhumation in caves seems to have been Fig. 16.—Carved stone slab from Placeres del Oro, Guerrero. more common among the Mixtec than the Zapotec, and Burgoa writes of cave burials at Chalcatongo, supposed to be the gate of paradise, where the dead were laid out dressed in rich garments, numbers of small idols in gold, stone and wood being placed in niches in the cave-walls. The same author tells of the Zapotec kings being deposited at Mitla, in a chamber in one of the temples, clad in gorgeous ornaments and holding shield and spear. It is possible that primary burial was reserved for those of high rank. An extremely interesting burial has been found at a place called Placeres del Oro, in the valley of the Rio del Oro, a southern tributary of the Rio de las Balsas. The chief interest of the remains here found lies in the very peculiar art of the sculptured slabs between which the bones were deposited (Fig. 16). The walls of the