ciently a Martian astronomer to come much closer than a rough guess without the splendid charts and delicate instruments with which, as an officer of the Heliumite Navy, I had formerly reckoned the positions of the vessels on which I sailed.
That a northerly course would quickest lead me toward the more settled portions of the planet immediately decided the direction that I should steer. Beneath my hand the cruiser swung gracefully about. Then the button which controlled the repulsive rays sent us soaring far out into space. With speed lever pulled to the last notch, we raced toward the north as we rose ever farther and farther above, that terrible valley of death.
As we passed at a dizzy height over the narrow domains of the therns the flash of powder far below bore mute witness to the ferocity of the battle that still raged along that cruel frontier. No sound of conflict reached our ears, for in the rarified atmosphere of our great altitude no sound wave could penetrate; they were dissipated in thin air far below us.
It became intensely cold. Breathing was difficult. The girl, Phaidor, and the black pirate kept their eyes glued upon me. At length the girl spoke.
"Unconsciousness comes quickly at this altitude," she said quietly. "Unless you are inviting death for us all you had best drop, and that quickly."
There was no fear in her voice. It was as one
