At every step the atmosphere got warmer, and they detected a slight gaseous odor in the air. Finally, after an arduous tramp of an hour, they climbed up a steep hill and looked sharply down into a vast bubbling lake of molten matter more than a thousand yards below. Branasko noticed a stone weighing several tons evenly balanced on the verge of the great gulf, and pushed it with both his hands. It rocked, broke loose from its slender hold on the cliff and bounded out into the red space. Down it went, lessen-ing as it sank till it became a mere black speck and then disappeared. “That's where the dead go,” said Branasko gloomily. Just then the American, happening to glance up, saw something like a huge black bird with outspread wings circling about in the red light over the pit. Branasko saw it, too, and his face paled and a tremolo was in his voice when he spoke. “It is one of the 'vultures of death;' don't stir; we won't be seen if we remain where we are!” The strange machine sank lower over the lake of fire, till, as if buoyed up on the hot air, with faintly quivering wings, it paused. A man opened a door of the black car and carelessly threw out the bodies of a woman and a child. The bodies whirled over and over and disappeared in the pit, and the man closed the door. The machine then rose and gracefully winged its flight to the east. In a moment others came with their grim burdens, and still others, till the mouth of the pit was dark with them. “Something has happened,” whispered Branasko, “some great calamity, for surely so many people do not die in Alpha in a single day.” For an hour they watched the coming and going of the vultures, till, finally the last one hovered over the lake of fire. Suddenly the machine swerved so near to Branasko and Johnston that they shrank close to the earth to keep from being seen. Something was evidently wrong with the machine, for there was a wild look of desperation on the driver's face as he tugged excitedly at the pilot-wheel. But all his efforts only caused the air-ship to dart irregularly from side to side, and, now and then, to strike the rocks of the pit's mouth, to shoot up suddenly, or to sink dangerously down toward the fire. “He is losing control of it,” whispered Branasko, “he does not know what to do. See, he is trying to lighten the load, by kicking out the body.”