His tube was pointing almost continuously now at the metal door leading from the dome building. The Rogans inside, at the shocks that were battering down a section of their great building, were all trying to get out to the yard at once. In a stream they rushed for the doorway. And in loathsome heaps they fell at the impact of the ray and shriveled to nothingness on the bombarded threshold. "Once more--" Brand repeated, his voice hoarse and tense. And as though the monster heard and understood, it rushed again with all its vast weight and force against the wall in a mad effort to escape the things that were blasting the living flesh from its colossal framework. This charge was the last. With a roaring crash a section of the building thirty yards across went back and down, leaving the massive roof to sag threateningly on its battered truss-work. * * * * * It was as though the side of an ant-heap had been ripped away. Inside the domed building hundreds of Rogans ran this way and that on their elongated legs, squealing in their staccato, high-pitched tongue. With blind fury the mad monster charged in through the gaping hole it had battered for itself. In all directions the Rogans scattered. Then an authoritative tall figure with a tube in each of its four sucker-disks, whipped out a command and pointed to the great coils which lay immediately in the berserk monster's path. The command restored some sort of order. Losing their fear of the beast in their greater fear of the damage it might do, the Rogans massed to stop it before it could demolish the Rogan heart of power. At this point Brand saw an opening of the kind he had been praying for. The Rogans had retreated before the terrific charge of the monster in such a way that the space between its vast bulk and the control board was clear. "After me!" he shouted to Dex. "One of us has got to reach that lever while the creature's still there to shield us!" The two Earthmen dashed through the jagged hole in the wall and raced to the control board just as the huge lizard, a smoking mass, sank to the floor. Brand gazed almost fearfully at the lever-slot. Was there a reverse to the gravity-control action? There was room in the slot for the lever to be pulled down below the neutral point, if that meant anything.... * * * * * Behind them the great bulk of the dead lizard was disappearing with incredible quickness under the rays of the tubes directed on it. Now the pumpkin-shaped heads on the opposite side were visible through a fleeting glimpse of a skeleton that was like the framework of a skyscraper. And now the colossal bones themselves were melting, while over everything hung a pall of greasy black smoke. "Hurry, for God's sake!" gasped Dex.