y and the
tender-hearted regret of my own princess for the stern necessity which
demanded it.

I think that Phaidor regretted the thrill that the spectacle would have
afforded her rather than the fact that my decision left another enemy
alive to threaten us.

The man had now regained full possession of his faculties, and was
regarding us intently from where he lay bound upon the deck. He was a
handsome fellow, clean limbed and powerful, with an intelligent face
and features of such exquisite chiselling that Adonis himself might
have envied him.

The vessel, unguided, had been moving slowly across the valley; but now
I thought it time to take the helm and direct her course. Only in a
very general way could I guess the location of the Valley Dor. That it
was far south of the equator was evident from the constellations, but I
was not sufficiently a Martian astronomer to come much closer than a
rough guess without the splendid charts and delicate instruments with
which, as an officer in 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 rarefied 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 might say: "You had
better carry an umbrella. It is going to rain."

I dropped the vessel quickly to a lower level. Nor was I a moment too
soon. The girl had swooned.

The black, too, was unconscious, whil