In the line of priests an altercation arose as to who should have first place. A burly brute with all the refined intelligence of a gorilla stamped upon his bestial face was attempting to push a smaller man to second place, but the smaller one appealed to the high priestess, who in a cold peremptory voice sent the larger to the extreme end of the line. Tarzan could hear him growling and rumbling as he went slowly to the inferior station.

Then the priestess, standing above him, began reciting what Tarzan took to be an invocation, the while she slowly raised her thin, sharp knife aloft. It seemed ages to the ape-man before her arm ceased its upward progress and the knife halted high above his unprotected breast.

Then it started downward, slowly at first, but as the incantation increased in rapidity, with greater speed. At the end of the line Tarzan could still hear the grumbling of the disgruntled priest. The man’s voice rose louder and louder. A priestess near him spoke in sharp tones of rebuke. The knife was quite near to Tarzan’s breast now, but it halted for an instant as the high priestess raised her eyes to shoot her swift displeasure at the instigator of this sacrilegious interruption.

There was a sudden commotion in the direction of the disputants, and Tarzan rolled his head in their direction in time to see the burly brute of a priest leap upon the woman opposite him, dashing out her brains with a single blow of his heavy cudgel. Then that happened which Tarzan had witnessed a hundred times before among the wild denizens of his own savage jungle. He had seen the thing fall upon Kerchak, and Tublat, and Terkoz; upon a dozen of the other mighty bull apes of his tribe; and upon Tantor, the elephant; there was scarce any of the males of the forest that did not at times fall prey to it. The priest went mad, and with his heavy bludgeon ran amuck among his fellows.

His screams of rage were frightful as he dashed hither and thither, dealing terrific blows with his giant weapon, or sinking his yellow fangs into the flesh of some luckless victim. And during it the priestess stood with poised knife above Tarzan, her eyes fixed in horror upon the maniacal thing that was dealing out death and destruction to her votaries.

Presently the room was emptied except for the dead and dying on the floor, the victim upon the altar, the high priestess, and the madman. As the cunning eyes of the latter fell upon the woman they lighted with a new and sudden lust. Slowly he crept toward her, and now he spoke; but this time there fell upon Tarzan’s surprised ears a language he could understand; the last one that he would ever have thought of employing in attempting to converse with human beings—the low guttural barking of the tribe of great anthropoids—his own mother tongue. And the woman answered the man in the same language.

He was threatening—she attempting to reason with him, for it was quite evident that she saw that he was past her authority. The brute was quite close now—creeping with clawlike hands extended toward her around the end of the altar. Tarzan strained at the bonds which held his arms pinioned behind him. The woman did not see—she had forgotten her prey in the horror of the danger that threatened herself. As the brute leaped past Tarzan to clutch his victim, the ape-man gave one superhuman wrench at the thongs that held him. The effort sent him rolling from the altar to the stone floor on the opposite side from that on which the priestess stood; but as he sprang to his feet the thongs dropped from his freed arms, and at the same time he realized that he was alone in the inner temple—the high priestess and the mad priest had disappeared.

And then a muffled scream came from the cavernous mouth of the dark hole beyond the sacrificial altar through which the priestess had entered the temple. Without even a thought for his own safety, or the possibility for escape which this rapid series of fortuitous circumstances had thrust upon him, Tarzan of the Apes answered the call of the woman in danger. With a little bound he was at the gaping entrance to the subterranean chamber, and a moment later was running down a flight of age-old concrete steps that led he knew not where.

The faint light that filtered in from above showed him a large, low-ceiled vault from which several doorways led off into inky darkness, but there was no need to thread an unknown way, for there before him lay the objects of his search—the mad brute had the girl upon the floor, and gorilla-like fingers were clutching frantically at her throat as she struggled to escape the fury of the awful thing upon her.

As Tarzan’s heavy hand fell upon his shoulder the priest dropped his victim, and turned upon her would-be rescuer. With foam-flecked lips and bared fangs the mad sun-worshiper battled with the tenfold power of the maniac. In the blood lust of his fury the creature had undergone a sudden reversion to type, which left him a wild beast, forgetful of the dagger that projected from his belt—thinking only of nature’s weapons with which his brute prototype had battled.