Page:Thuvia, Maid of Mars.djvu/50

32 sudden transition from sleep to waking that proves so difficult a thing for most Earth folk.

Above him raced the long, light passenger fliers, plying, each in its proper plane, between the numerous landing stages for internal passenger traffic. Landing stages that tower high into the heavens are for the great international passenger liners. Freighters have other landing stages at various lower levels, to within a couple of hundred feet of the ground; nor dare any flier rise or drop from one plane to another except in certain restricted districts where horizontal traffic is forbidden.

Along the close-cropped sward which paves the avenue ground fliers were moving in continuous lines in opposite directions. For the greater part they skimmed along the surface of the sward, soaring gracefully into the air at times to pass over a slower-going driver ahead, or at intersections, where the north and south traffic has the right of way and the east and west must rise above it.

From private hangars upon many a roof top fliers were darting into the line of traffic. Gay farewells and parting admonitions mingled with