The dead, according to current Tusayan thought, become rain-cloud gods, or powerful intercessors with those deities which cause or send the rains. Hence, the religious society to which the deceased belonged, and the members of the clan who survive, place in the mortuary bowls, or in the left hand of their friend, the paho or prayer emblem for rain; hence, also, in prayers at interment they address the breath body of the dead as a _katcina_, or rain god. These _katcinas_, as divinized ancestors, are supposed to return to the villages and receive prayers for rain. In strict accord with this conception the rain-cloud symbol is placed, in some instances, on the slab of rock in the graves of the dead at Sikyatki. It proves to me that the cult of ancestor worship, and the conception that the dead have power to bring needed rain, were recognized in Sikyatki when the pueblo was in its prime. One of these slabs is perforated by a small hole, an important fact, but one for which I have only a fanciful explanation, namely, to allow the escape of the breath body. Elsewhere I have found many instances of perforated mortuary stone slabs, which will be considered in a report of my excavations in 1896. OBSIDIAN Many fragments of obsidian, varying in size, are found strewn over the surface of the majority of ancient ruins in Tusayan, and the quantity of this material on some mounds indicates its abundance in those early habitations. This material must have been highly prized for knives, arrowpoints, and weapons of various kinds, as several of the graves contained large fragments of it, some more or less chipped, others in natural forms. The fact of its being deemed worthy of deposit in the graves of the Sikyatkians would indicate that it was greatly esteemed. I know of no natural deposit of obsidian near Sikyatki or in the province of Tusayan, so that the probability is that these fragments had been brought a considerable distance before they were buried in the earth that now covers the dead of the ancient pueblos. [Illustration: BUREAU OF AMERICAN ETHNOLOGY SEVENTEENTH ANNUAL REPORT PL. CLXXI STONE IMPLEMENTS FROM PALATKI, AWATOBI, AND SIKYATKI] NECKLACES, GORGETS, AND OTHER ORNAMENTS