two thin ribbons of red Martian farm land bordering canals that bring the precious waters from the annually melting ice caps at the poles. Beyond these I saw no signs of human life in all the five thousand miles that lie between Lesser Helium and Horz.

It is always a little saddening to me to look down thus upon a dying world, to scan the endless miles of ocher, mosslike vegetation which carpets the vast areas where once rolled the mighty oceans of a young and virile Mars, to ponder that just beneath me once ranged the proud navies and the merchant ships of a dozen rich and powerful nations where today the fierce banth roams a solitude whose silence is unbroken except for the roars of the killer and the screams of the dying.

At night I slept, secure in the knowledge that my directional compass would hold a true course for Horz and always at the altitude for which I had set it-a thousand feet, not above sea level but above the terrain over which the ship was passing. These amazing little instruments may be set for any point upon Barsoom and at any altitude. If one is set for a thousand feet, as mine was upon this occasion, it will not permit the ship to come closer than a thousand feet to any object, thus eliminating even the danger of collision; and when the ship reaches its objective the compass will stop it a thousand feet above. The pilot whose ship is equipped with one of these directional compasses does not even have to remain awake; thus I could travel day and night without danger.

It was about noon of the third day that I sighted the towers of ancient Horz. The

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