At that moment, Hagendorff finished his job and turned around. * * * * * Their eyes met. For a breathless instant nothing happened, save that the smile on the titan's face changed to surprise and then fury. Garth scrambled to his feet. The movement brought a bellow of rage, and the manikin saw two enormous hands converging on him in a sweep that bade fair to crush every bone in his dwarfed body. Leaping backwards instinctively, he hurled the pliers at the giant's head. They were well aimed, and he saw them strike the temple, stopping the man in his tracks. He thundered, more from anger than pain. His heart pounding wildly, Garth ran back to a position behind a rack of test tubes. It was from there that he saw Hagendorff, cursing crazily, grab up a machinist's hammer and advance upon him. All sanity had apparently left the giant. His great face was flushed and distorted, and a growing welt showed where the pliers had clipped him. Garth suddenly knew that if he were captured again, death would not come in the chamber, but from those powerful hands, or the weapon they clutched. The hammer swung back for a crushing blow. But in the instant it hung poised, Garth lifted a half-filled test tube from the rack before him and swished its contents forward. The tube held sulphuric acid, and it sprayed over Hagendorff's face. The hammer pitched from his hand; he clutched at his eyes and stumbled back, shrieking in agony. Garth at once ran to the edge of the table, swung himself over and slid down the leg to the floor. The laboratory door was open and he dashed for it. But, whether or not Hagendorff could see his frantic retreat, he anticipated it, and with a reeling plunge he got there first. Fumbling, he found the key in the hole and turned it. The room was sealed. * * * * * Beginning then, the blind Hagendorff was a man berserk. With a sobbing roar of pain and fury, he lashed round for the foot-high figure that dodged and wheeled and zig-zagged to keep from his threshing arms and his hands. A table crashed over, and a flood of chemicals mixed and boiled on the floor; then another, as the giant blundered blindly into it. The cages of animals split open, and guinea pigs, rabbits and insects scuttled from their prisons, fleeing to the corners from the wild plunges of the raging German. Garth went reeling from a glancing blow, and fell against an over-turned stool under a far table where he could hardly breathe for the mixed odors of spilt chemicals. By some sixth sense, Hagendorff seemed to locate him, for his huge body turned and came directly for him. But Garth did not wait. Seizing the stool he whirled it so that it slid smash into the giant's legs. The man pitched over with a grunt, striking the floor so hard that the planks shivered. He did not rise. He lay there, in a wreckage of glass and splintered wood and stinking chemicals, moaning slightly.