Aside from the peculiar “guyave” or “piki” baking oven, there is but little variation in the form of indoor fireplaces in Cibola, while in Tusayan it appears to have been subjected to about the same mutations already noted in the outdoor cooking pits. A serious problem was encountered by the Tusayan builder when he was called upon to construct cooking-pit fireplaces, a foot or more deep, in a loom of an upper terrace. As it was impracticable to sink the pit into the floor, the necessary depth was obtained by walling up the sides, as is shown in Fig. 68, which illustrates a second-story fireplace in Mashongnavi. Other examples may be seen in the outdoor chimneys shown in Figs. 72 and 73. [Illustration: Fig. 67. A fireplace and mantel in Sichumovi.] [Illustration: Fig. 68. A second-story fireplace in Mashongnavi.] [Illustration: Plate LXXXV. A Tusayan interior.] A modification of the interior fireplace designed for cooking the thin, paper-like bread, known to the Spanish-speaking peoples of this region as “guyave,” and by the Tusayan as “piki,” is common to both Cibola and Tusayan, though in the former province the contrivance is more carefully constructed than in the latter, and the surface of the baking stone itself is more highly finished. In the guyave oven a tablet of carefully prepared sandstone is supported in a horizontal position by two slabs set on edge and firmly imbedded in the floor. A horizontal flue is thus formed in which the fire is built. The upper stone, whose surface is to receive the thin guyave batter, undergoes during its original preparation a certain treatment with fire and piñon gum, and perhaps other ingredients, which imparts to it a highly polished black finish. This operation is usually performed away from the pueblo, near a point where suitable stone is found, and is accompanied by a ceremonial, which is intended to prevent the stone from breaking on exposure to the fire when first used. During one stage of these rites the strictest silence is enjoined, as, according to the native account, a single word spoken at such a time would crack the tablet. [Illustration: Fig. 69. Piki stone and chimney hood in Sichumovi.]