He went to the window, and absent-mindedly stared out. The whining hum from the great domed building off to the right, like the high-pitched droning of a swarm of gargantuan bees, came to his ears. He listened more intently, and leaned out of the window to look at the building.

Under that dome, it came to him again, was, in all probability, the mainspring of the Rogan mechanical power. If only he could get in there and look around! He might do some important damage; he might be able to harass the enemy materially before the time came for him to die.

He leaned farther out of the window, and examined the hundred feet or so of sheer wall beneath him. He saw, scrutinizing it intently, that the stone blocks that composed it were not smooth cut, but rough hewn, with the marks of the cutters' chisels plainly in evidence. Also there was a considerable ridge between each layer of blocks where the Rogans' mortar had squeezed out in the process of laying the wall.

Never in sanity would a man have thought of the thing Brand considered then. To attempt to clamber down that blank wall, with only the slight roughness of the protruding layers of mortar to hang on to, was palpable suicide!

Brand shrugged. He observed that to a man already condemned to death, the facing of probable suicide shouldn't mean much.

With scarcely an increase in the beating of his heart, he swung one leg out over the broad sill. If he fell, he escaped an infinitely worse death; if he didn't fall, he might somehow win his way into that domed building whence the hum came.

Cautiously, clutching at the rough stone with finger tips that in a moment or two became raw and bleeding masses, he began his slow descent. As he worked his way down, he slanted to the right, toward the near wall of the retaining yard whose end was formed by the round structure that was his goal.

Beneath him and to the left the broad street swarmed with figures: the tall ones of the Rogans and the shorter, sturdier ones of slaves. Any one of those dozens of grotesque pedestrians might glance up, see him, and pick him off with the deadly tubes. Under his fingers the mortar crumbled and left him hanging, more than once, by one hand. For fully five minutes his life hung by a thread apt to be severed at any time. But—he made it. Helped by the decreased gravity of the red spot, and released from inhibiting fear by the fact that he was already, figuratively, a dead man, he performed the incredible.

With a last slithering step downward, he landed lightly on the near wall of the enclosure, and started along its broad top toward his objective.

Now he was in plain sight of any one who might be looking out the windows of the tower building or from the dome ahead of him; but this was a chance he had to take, and at least he was concealed from the swarms in the street. Making no effort to hide himself by crawling along the top of the wall, he straightened up and began to run toward the giant dome.

Hardly had he gone a dozen steps when he suddenly understood the meaning of the high-walled enclosure to his right!

Off in a far corner rose a slate colored mound that at first glance he had taken for a great heap of inanimate dirt. The mound began to move toward him—and metamorphosed into an animal, a thing that made Brand blink his eyes to see if he were dreaming, and then stop, appalled, to look at it.