The hot, still days that followed were anxious ones for these last children of life. Not a trap was sprung. The beast did not drag his slimy body and tail across the heavily charged cable. The last of his kind, fighting the last battle of existence, it seemed that nature had endowed him with uncanny cunning. There was the life-giving water for whose possession no human kind challenged them, but this enemy was more terrible than any man, savage or civilized whom the earth had ever known. * * * * * During these anxious, watchful days Omega and Thalma went often to the Mirror and gazed into it in search of vapor clouds. And more than once those gossamer-like formations appeared over different parts of the world to gladden their hearts only to fade away before their vision. The reflections of those embryo clouds became less frequent as the days wore on. Omega and Thalma knew that they had no right to hope for the return of water vapor. Their instruments, so finely attuned as to appear endowed with intelligence, the records of the past and their own common sense told them that. But nature and life in the upper reaches of the air were dying as hard as their own hope. They knew that the aerial manifestations they witnessed were but symptoms of the death struggle. And yet a real cloud, dark and pregnant with moisture, suddenly appeared in the Mirror. Consulting the chart they saw that it was hovering over a great land of plain and mountains which formerly had been a part of the United States of America. "We will go and examine this gift from heaven," said Omega. "It moves over a once beautiful land, which the voices of history tell us, harbored a race of the free millions of years ago." "Yes, we will go," agreed Thalma. "It may be after all that Alpha will first see the light far from this dreadful hollow and--and--that monster out there in the lake." Omega hung his head. Well he knew that the presence of the monster was slowly killing his beloved. She complained not, but her dreams were disturbed with frightful visions, and often Omega awakened to find her at a window staring out over the lake with terror-stricken eyes. This new cloud was thousands of miles to the east but with fond anticipations they entered the ship and plunged toward it. But although they reached the spot in one hour, the last remnant of vapor dissolved before their eyes, and they turned sadly homeward, once more beaten by the inexorable decrees of fate.