But Hart was equal to the occasion and he shot the _Pioneer_ in the direction of the earth with such acceleration that we all were flattened into our supports with the same old violence. Then, with equal violence, we decelerated. The ring was following so closely that it actually rushed many hundreds of miles past us before it was brought to rest. From it there sprang one of the light pencils, and the _Pioneer_ was rocked as by a heavy gale when it rushed past on its harmless way into infinity. The enemy had missed. Meanwhile, Hart was operating another mechanism that was new to the _Pioneer_ and again he sighted along the tiny tube. This time there was no sound within, no ball of fire without, no visible ray. But, when he had pressed the release of this second energy, the ring seemed to shrivel and twist as if gripped by a giant's hand. It reeled and spun. Then, no longer in a balance of forces, it commenced its long drop earthward. His job finished and finished well, Hart Jones collapsed. * * * * * Following his more than three days and four nights of superhuman endeavor, it seemed strange to see Hart slumped white and still over the control pedestal. He who had energy far in excess of that of any of the rest of us had worn himself out. Having had no rest or sleep in nearly a hundred hours, the body that housed so wonderful a spirit simply refused to carry on. Tenderly we stretched him on the cabin floor, the _Pioneer_ drifting in space the while. The professor, who was likewise something of a physician, listened to his heart, drew back his eyelids, and pronounced him in no danger whatever. We slapped his wrists, sprinkled his face and neck with cold water from the drinking supply, and were soon rewarded by his return to consciousness. He smiled weakly and fell sound asleep. No war in the universe could have wakened him then, so we lifted him to his feet--rather I should say, we guided his practically floating body--and strapped him in George's hammock, preparing for the homeward journey. Though dangling from the straps in a position that would be vertical were we on earth, he slept like a baby. George took the controls in Hart's place and the professor and I returned to our accustomed supports. The return trip was considerably slower, as George did not wish to push the _Pioneer_ to its limit as had been necessary when coming out to meet the enemy, nor was he able to keep control of the ship against a too-rapid acceleration. Consequently, the rate of acceleration was much lower and we were not nearly as uncomfortable as on the outgoing trip. Thus, nearly ten hours were required for the return. And Hart slept through it all. * * * * *