So it was that I remained hidden until after Thurid had disappeared over the edge of the steep bank beside the sea a quarter of a mile away. Then, with Woola following, I hastened across the open after the black dator. The quiet of the tomb lay upon the mysterious valley of death, crouching deep in its warm nest within the sunken area at the south pole of the dying planet. In the far distance the Golden Cliffs raised their mighty barrier faces far into the starlit heavens, the precious metals and scintillating jewels that composed them sparkling in the brilliant light of Mars’s two gorgeous moons. At my back was the forest, pruned and trimmed like the sward to parklike symmetry by the browsing of the ghoulish plant men. Before me lay the Lost Sea of Korus, while farther on I caught the shimmering ribbon of Iss, the River of Mystery, where it wound out from beneath the Golden Cliffs to empty into Korus, to which for countless ages had been borne the deluded and unhappy Martians of the outer world upon the voluntary pilgrimage to this false heaven. The plant men, with their blood-sucking hands, and the monstrous white apes that make Dor hideous by day, were hidden in their lairs for the night. There was no longer a Holy Thern upon the balcony in the Golden Cliffs above the Iss to summon them with weird cry to the victims floating down to their maws upon the cold, broad bosom of ancient Iss. The navies of Helium and the First Born had cleared the fortresses and the temples of the therns when they had refused to surrender and accept the new order of things that had swept their false religion from long-suffering Mars. In a few isolated countries they still retained their age-old power; but Matai Shang, their hekkador, Father of Therns, had been driven from his temple. Strenuous had been our endeavors to capture him; but with a few of the faithful he had escaped, and was in hiding—where we knew not. As I came cautiously to the edge of the low cliff overlooking the Lost Sea of Korus I saw Thurid pushing out upon the bosom of the shimmering water in a small skiff—one of those strangely wrought craft of unthinkable age which the Holy Therns, with their organization of priests and lesser therns, were wont to distribute along the banks of the Iss, that the long journey of their victims might be facilitated. Drawn up on the beach below me were a score of similar boats, each with its long pole, at one end of which was a pike, at the other a paddle. Thurid was hugging the shore, and as he passed out of sight round a