Carr shuddered. It was the place of sacrifice they had seen in the rulden, and the natives were in hiding as before. Nazu would be first to go; then Ora, most likely. He strained desperately at his bonds when he realized the awful significance of their position. It was incredible that Ora was here and in the hands of these unspeakable monsters. Why, she'd be thrown into the incandescent folds of the flapping fire-god, along with the rest of them! He groaned in an agony of self-recrimination; he should not have allowed her to come on this mad voyage. Then came that roaring column of flame from out the crater, and the weird fluttering thing whose intense heat radiated across the intervening space like the breath of a blast furnace. The rumble of drums commenced, and thousands of the red men dashed over the rocky area to worship at the shrine of their pitiless god. As their monotonous chant rose high, Nazu was rushed to the edge of the pit. The ghastly, shimmering heat-ghost drifted hungrily to await the flinging of the slight form into its consuming embrace. Carr was glad to see that Ora had turned her head. * * * * * And then there came a sucking noise from the depths of the crater, and the pillar of blue flame vanished abruptly, the incandescent ghost-shape flapping disconsolately in its wake. The chant of the savages trailed off into a chorus of disgruntled murmurings and the booming of the drums died down in disappointment. The worshippers had been cheated of their sadistic pleasure. There was something wrong with the timing of the rite; their mysterious fire-god had granted the captives a reprieve. But the prisoners were not deceived by the solicitous treatment accorded them by their captors when they were returned to the cave and their bonds were severed. For well they knew that at the next appearance of the phenomenon of the pit they would be dragged off to the sacrifice. Sooner or later all of them were to meet the fate of those given into the embrace of the heat-demon. A guard of fifty or more of the savages, armed with blow-guns and stone hatchets, paraded continuously before the mouth of the cave as one of their number returned with a huge woven container of fruits and nuts of strange form and color. This was set before them and the bearer withdrew. "Humph!" Mado grunted. "Seems like they want to fatten us up for this heated sheet of theirs. Like hogs fattened for the market." But he reached for the striped yellow melon atop the heap, and, at a bright nod of approval from Nazu, bit into its smooth skin. Carr's stomach rebelled when he looked at the food. He could not bear the sight of the stuff, sitting there in the damp cavern with Ora's blue eyes regarding him in the dim light. Those wide eyes held a gleam of hope and trust that would not be discouraged. * * * * *