Pictures were forming in his mind; he saw the huge steel and glass towers of the city, tossed and torn by the convulsive writhings of the earth beneath. Great engineers had said that the city was safe, that no tremors would ever disturb it, but they knew nothing of the terrific force of such a shock as this. Those massive buildings, thousands of feet high, would now be mere heaps of twisted junk. Holden closed his eyes to shut out the picture, but to no avail. His sister! God! She was probably one of the millions who now lay, crushed, bleeding and helpless beneath the wreckage of the too-proud metropolis. "My boy," the professor was speaking, "we must stay with our work, no matter what happens." His voice was low; his entire family had been wiped out, without doubt, but Science must be served. For hours the two sat before their instruments, as shock after shock was recorded. Jones came down from the television room above, and his report confirmed their observations in horrible detail. "All communications from the city itself are cut off, but an airliner from England, which was about to dock, has broadcast the scene. Aid is being rushed from all over the world, but at a conservative estimate ten million are already dead, and millions more will probably die, buried and hidden as they are beneath the wreckage." At last, nearly five hours after the first shock, the Professor stood up. "I think that is all. My prophecies have come true, and at last my theories will be needed. But the cost of it all, the horrible cost!" * * * * * Two weeks later a group of men were seated around the conference table in the spacious offices of the Department of Public Safety of the World Union. All faces were turned toward the stooped figure of Professor Erickson, who was speaking from the head of the table. "Gentlemen, I have outlined to you, only too briefly, the damage caused by the quake a few days ago. I now state that a repetition of such a disaster is imminent. Great faults have formed in the basic granites throughout the entire globe. Observations recorded during five centuries since the first conception of the idea by Dr. Maxwell Allen in 1931, show conclusively that Earth-tides, set up by the attraction of the moon, cause a sweeping series of stresses and strains. These, coming to a fault, produce earthquakes. Now that there are huge faults in the basic rock, these quakes will be of a tremendous force and range which the most modern structures will be unable to resist." "Professor," spoke John Dorman, Secretary of Public Safety, "if all this is true, and we are assured that it is, what on earth can be done about it?" "Gentlemen, during nearly seventy years I have studied that problem, and I have come to only one conclusion. Nothing on earth can be done about it, if you permit the remark, but men from earth can do something. _Destroy the moon!_"