The World President stepped aside, and as he did so Dr. Marlin rose, stepped forward to the great platform's edge, and looked quietly out over the great room's occupants. I was aware as he did so of a quality of utter tension in all the hundreds in that room, of a hushed silence, in which the slightest sound seemed unnaturally loud. Through the great windows there came a deep hum of sound from the sunlit surrounding city, but in the big room itself was silence almost complete until Dr. Marlin's strong, deep voice broke it. "It was thirteen days ago," he said, "that the acceleration of our sun's rotatory speed was first noted, thirteen days ago that it first began to spin faster. In those days we of the world's observatories have sought unceasingly for the cause, whatever it was, that was behind this strange acceleration of the sun's spin, and have sought for that cause even more intently in the last few days, since it was recognized by us, that this increasing rotatory speed foreshadowed the division of the sun and the doom of almost all its planets. That acceleration of speed was too exact, too uniform each day, to be the result of interior disturbances. It could not be the result of the influence of some dark body passing the solar system in space, for such a body would affect the planets also. What, then, could be the thing's cause? That is what I and all astronomers have been seeking to solve in the last days. That great enigma has finally been solved, not by an astronomer, but by a physicist--by Dr. Robert Whitely, my fellow-professor at North American University. "It will be remembered that when the first great effects of the sun's increased spin became apparent on Earth, the great electrical storms and temperature-changes that still are troubling Earth, Dr. Whitely announced the discovery of new vibrations which were apparently emanating from the troubled sun also. That new vibration lay in frequency between the Hertzian and the light vibrations, an unexplored territory in the field of etheric vibrations. It seemed, Dr. Whitely then stated, a force-vibration of some sort, the weak reflected impulses from it, that reached his instruments, affecting them as tangible force. It seemed reasonable to suppose, therefore, that this new force-vibration or ray was being generated inside the sun's disturbed mass, just as light vibrations and heat vibrations and cosmic-ray vibrations and many others are generated by and radiated from the sun. * * * * *