the time-dimension, from the past toward the future, only because the electrons that compose it are constantly moving along the space-dimensions, are constantly revolving around their nucleus, at the same unvarying speed. If you stopped that revolving of electrons, the ball of metal would become static, timeless, would cease to move along the time-dimension. But suppose instead of stopping the electronic movement, you accelerated it, speeded it up? Then the ball of metal whose electronic activity was thus accelerated would move on through time faster. Everything around it would still move along the time-dimension at the same rate, but it would be going faster, would speed on into the future, ahead of the things around it. And the more its electronic motion was accelerated, the farther into the future it would go.

"In the same way, if the electronic motion was reversed, the metal ball would go backward along the time-dimension, would speed back into the past. Thus you see how such a principle could be applied practically and enable one to speed into past or future at will, simply by accelerating or reversing the motion of the electrons making up his vehicle, or car."

"It seems reasonable," I admitted, "but the difficulty remains, for how could the movement of electrons be thus accelerated or reversed at will? Why, no man has ever even seen an electron, or ever will, they're so infinitesimally tiny. Then how affect their speeds, their directions?"

"You mention a difficulty," Lantin replied, "but it could be overcome, Wheeler. As you say, no man has ever seen an electron, but for all that, men have done some strange things with electrons. They have shot them through films of water-vapor and have thus been able to record their speeds and courses, without seeing the actual electrons. And just recently, an American scientist was able to change the course of electronic motion entirely, and shoot a stream of electrons in any direction at will, the so-called cathode rays. When that has been done, it doesn't seem altogether impossible to change their motion in another way, by accelerating or reversing it."

"But there's another thing, Lantin," I said; "even though you achieved the impossible and found a way of time-traveling, how would you find Cannell? How could you find him, without knowing what age or what place the Raider has taken him to? It seems like hunting for a needle in a haystack, a thousand times magnified in difficulty."

Without answering, Lantin went to a cabinet and brought forth a big globe, which he 

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