Page:The warlord of Mars.djvu/151



TRAIGHT  toward the north, day and night, our destination compass led us after the fleeing flier upon which it had remained set since I first attuned it after leaving the thern fortress.

Early in the second night we noticed the air becoming perceptibly colder, and from the distance we had come from the equator were assured that we were rapidly approaching the north arctic region.

My knowledge of the efforts that had been made by countless expeditions to explore that unknown land bade me to caution, for never had flier returned who had passed to any considerable distance beyond the mighty ice-barrier that fringes the southern hem of the frigid zone.

What became of them none knew—only that they passed forever out of the sight of man into that grim and mysterious country of the pole. [ 139 ]