The Tree! Terror leaped within him like a wild thing. The Tree, quivering with unbearable clarity in the thick, dim air, writhed above him, blossoms blazing with bloody radiance and every branch vibrant and undulant to the tune of that unholy song. Then he was aware of the lovely, luminous whiteness of the priestess swaying forward under the swaying limbs, her hair rippling back from the loveliness of her as she moved. Choked and frenzied with unreasoning terror, he mustered every effort that was in him to turn, to run again like a mad-man out of that dreadful hollow, to hide himself under the weight of all space from the menace of the Tree. And all the while he fought, all the while panic drummed like mad in his brain, his relentless body plodded on straight toward the hideous loveliness of that siren singer towering above him. From the first he had felt subconsciously that it was Thag who called, and now, in the very center of that ocean of vibrant power, he knew. Gripped in the music's magic, he went on. All over the clearing other hypnotized victims were advancing slowly, with mechanical steps and wide, frantic eyes as the tree-folk came helplessly to their god's calling. He watched a group of little, dusky sacrifices pace step by step nearer to the Tree's vibrant branches. The priestess came forward to meet them with outstretched arms. He saw her take the foremost gently by the hands. Unbelieving, hypnotized with horrified incredulity, he watched her lead the rigid little creature forward under the fabulous Tree whose limbs yearned downward like hungry snakes, the great flowers glowing with avid color. [Illustration: "The priestess led the rigid little creature forward under the fabulous tree."] He saw the branches twist out and lengthen toward the sacrifice, quivering with eagerness. Then with a tiger's leap they darted, and the victim was swept out of the priestess' guiding hands up into the branches that darted round like tangled snakes in a clot that hid him for an instant from view. Smith heard a high, shuddering wail ripple out from that knot of struggling branches, a dreadful cry that held such an infinity of purest horror and understanding that he could not but believe that Thag's victims in the moment of their doom must learn the secret of his horror. After that one frightful cry came silence. In an instant the limbs fell apart again from emptiness. The little savage had melted like smoke among their writhing, too quickly to have been devoured, more as if he had been snatched into another dimension in the instant the hungry limbs hid him. Flame-tipped, avid, they were dipping now toward another victim as the priestess paced serenely forward. * * * * *