"Ho!" roared the green man, and came at them like a furious bull. It seemed characteristic of his kind to attack without parley. The torch dropped as he came. There was no resisting that mighty bulk. Unarmed, and with scant room to move backward, the two Americans went down; and that would have been the end of the battle if Ah-eeda, who had shrunk to one side out of the way of the combatants, had not snatched up the still flaming torch and held it against the naked back of the greenish giant. With a scream of anguish the latter ceased throttling the Americans, clapped his hands to his scorched back and rolled clear of them. Instantly they staggered to their feet and fled down the roadway after the light-footed Ah-eeda. Behind them the screams of the green man made the night hideous. "Damn him!" panted Ward; "he'll have the whole town on our heels!" Providentially, at that moment the road debouched into the great square. This they crossed at a run, and so, for the last time, entered the Palace of the Heads. Its wide halls and chambers were practically deserted. Past the crystal chamber where they had first materialized into this strange world they dashed, and through the far door and down the corridor to the blank wall. Already in the rear could be heard the sound of pursuit, the rising clamor of the mob. Ward hammered on the wall with both fists. "Zoro! Zoro! let us in!" Now the first of the mob had entered the corridor. "Zoro! Zoro!" Noiselessly, and just in time, the wall parted and they sprang through, Miles half carrying the slender form of Ah-eeda. The wall closed behind them, obliterating the fierce cries and footbeats of their pursuers. * * * * * In front of them was Zoro, his hairless head projecting from the tubular container. Ah-eeda shrank fearfully into Miles' embrace. All the other Heads were ranged back of Zoro, but there was something odd about them. The massive craniums lolled loosely to one side or another and the curiously colored eyes were glazed or filmed. Zoro held his head erect, but only with an effort, and his features were drawn and ghastly looking. "Yes," he said in a feeble voice, "the Heads are dying. You need not tell me that you have failed. In the end force always fails. No longer will the veins of the people yield their blood to us, and without their blood we cannot live. Soon three hundred thousand years of intelligence will be no more." His voice faltered.