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LOST IN THE SKY slightly put out at being detected and commanded me to keep the matter to myself, explaining that the passage from the tower led directly to his apartments, and was known only to him. If I can reach the roof of the barracks and get my machine I can be in Sab Than's quarters in five minutes; but how am I to escape from this building, guarded as you say it is?"

"How well are the machine sheds at the barracks guarded?" I asked.

"There is usually but one man on duty there at night upon the roof."

"Go to the roof of this building, Kantos Kan, and wait me there."

Without stopping to explain my plans I retraced my way to the street and hastened to the barracks. I did not dare to enter the building, filled as it was with members of the air-scout squadron, who, in common with all Zodanga, were on the lookout for me.

The building was an enormous one, rearing its lofty head fully a thousand feet into the air. But few buildings in Zodanga were higher than these barracks, though several topped it by a few hundred feet; the docks of the great battleships of the line standing some fifteen hundred feet from the [273]