out ahead. They interpenetrated each other and went on, blindly.

It was a hundred years before the last of the run-away derelicts blundered to destruction or was picked up by other space-ships which then still roved the space-ways. Because there was no defense against the fighting-beams, which were aimed by electronic devices, a ship did not cease to fight when its crew was dead. And every crew had died when a fighting-beam lingered briefly on their ship. There was not one single survivor of the Battle of Canis Major. The fleets plunged at each other, and every living thing in both fleets had perished instantly. Thereafter the empty ships fought on as robots against all other ships. So there were no more wars.

For two hundred years after that battle, the planets of the Galaxy continued to mount their projectors and keep their detector-screens out. But war had defeated itself. There could be no victories, but only joint suicides. There could be no conquests, because even a depopulated planet's projectors would still destroy all life in any approaching space-ship for as many years as the projectors were powered for. But in time, more especially after matter-transmitters had made space-craft useless, they were forgotten. All but those which went into museums for the instruction of the young.

These resuscitated weapons were now at work to find and kill Kim and Dona. In a sense it was like trying to kill flies with a sixteen-inch gun. The difficulties of aiming were extreme. To set up a detector-field and neutralize it would take time and skill which were not available.

So the beams swept through great arcs, with operators watching for signs of contact. It was long minutes after the first contact before the instruments on the projectors recorded it, because the news could only go back at the speed of light. Then the projectors had to retrace their path, and the Starshine had moved. The beams had to fumble blindly for the fugitives, and they told of each touch, but only after it occurred. And Kim struggled to make his course unpredictable.

In ten hours the beam struck four times only, because Kim changed course and acceleration so fiercely and so frequently that a contact could only be a matter of chance.

Then for a long time there was no touch at all. In two days Alphin, the sun, had dwindled until it was merely the brightest of the stars, with a barely perceptible disk. On the third day the beam found them yet again, and Dona burst into hysterical sobs. But it was not 

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