proves nothing. The Raider may be some thing of the far future, either a strange product of ages of change and evolution, or a visitor from another planet, racing through time and snatching up victims in every age and land. You remember that Cannell was seized at Angkor? And a thousand years ago, Angkor was a mighty city, and who knows but the Raider was speeding back to the days of Angkor's life and greatness, when it chanced on Cannell there? It is a strange business, Wheeler; but one thing I am certain of, and that is that the Raider does come from some time far in the future, and that it has taken Cannell back with it to that time."

"But the method," I insisted, "the method of traveling through time? How is that accomplished? Cannell spoke of a theory he had concerning it. And he gave you those notes—"

"I've examined those notes," Lantin said, "and rough and fragmentary as they are, I think that in them lies the secret of time-traveling. Cannell knew something of modern science, Wheeler, and the conclusions he drew concerning the Raider are significant. It was his theory that as time is the fourth dimension of matter, there is no basic reason why we can't move at will along that dimension. We can move as we wish in the other three, up-and-down, right-and-left, and back-and-forward, so why not in the fourth, that is, sooner-or-later?

"And his idea, as expressed in his notes, was that the Raider's movement along the time-dimension was based on electronic acceleration. You know the electronic system as well as I, and realize that the smallest division of matter, the atom, is nothing but a number of electrons, or particles of electricity, revolving around a nucleus. Cannell believed, and I think he was right, that that movement of electrons is the basis of the movement along the time-dimension.

"To make you understand that, let me take an example. Suppose all motion on earth stopped entirely, so that there was not the least bit of visible motion in earth or heavens. Sun, moon, stars, ships, clocks, trains, rivers, people, every form of motion stopping completely, so that the earth was a completely motionless world. Then would it not be a timeless world also? In other words, without change there would be no such thing as time, for time depends on and is measured by change. So that all movement along the fourth or time-dimension is intimately related to movement along the other three or space-dimensions.

"It is exactly the same with a single, isolated object. Take a metal ball, for instance. It moves steadily along 

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