No wonder she could not quit station.

She warns us to look out for the backwash of the bad vortex in which (her beam shows it) she is even now reeling.

The pits of gloom about us begin to fill with very faintly luminous films—wreathing and uneasy shapes. One forms itself into a globe of pale flame that waits shivering with eagerness till we sweep by. It leaps monstrously across the blackness, alights on the precise tip of our nose, pirouettes there an instant, and swings off. Our roaring bow sinks as though that light were lead—sinks and recovers to lurch and stumble again beneath the next blow-out. Tim's fingers on the lift-shunt strike chords of numbers—1:4:7:—2:4:6:—7:5:3, and so on; for he is running by his tanks only, lifting or lowering her against the uneasy air. All three engines are at work, for the sooner we have skated over this thin ice the better. Higher we dare not go. The whole upper vault is charged with pale krypton vapours, which our skin friction may excite to unholy manifestations. Between the upper and the lower levels—5,000, and 7,000, hints the Mark Boat—we may perhaps bolt through if.... Our bow clothes itself in blue flame and falls like a sword. No human skill can keep pace with the changing tensions. A vortex has us by the beak and we dive down a two-thousand-foot slant at an angle (the dip-dial and my bouncing body record it) of thirty-five. Our turbines scream shrilly; the propellers cannot bite on the thin air; Tim shunts the lift out of five tanks at once and by sheer weight drives her bulletwise through the maelstrom till she cushions with a jar on an up-gust, three thousand feet below.

"Now we've done it," says George in my ear. "Our skin-friction that last slide, has played Old Harry with the tensions! Look out for laterals, Tim, she'll want some holding."

"I've got her," is the answer. "Come up, old woman."

She comes up nobly, but the laterals buffet her left and right like the pinions of angry angels. She is jolted off her course in four ways at once, and cuffed into place again, only to be swung aside and dropped into a new chaos. We are never without a corposant grinning on our bows or rolling head over heels from nose to midships, and to the crackle of electricity around and within us is added once or twice the rattle of hail—hail that will never fall on any sea. Slow we must or we may break our back, pitch-poling.

"Air's a perfectly elastic fluid," roars George above the tumult. "About as elastic as a head sea off the Fastnet, aint it?"

THE STORM

He is less than just to the good element. If one intrudes on the Heavens when they are balancing their volt-accounts; if one disturbs the High Gods' market-rates by hurling steel hulls at ninety knots across tremblingly adjusted electric tensions, one must not complain of any rudeness in the reception. Tim met it with an unmoved countenance, one corner of his under lip caught up on a tooth, his eyes fleeting into the blackness twenty miles ahead, and the fierce sparks flying from his knuckles at every turn of the hand. Now and again he shook his head to clear the sweat trickling from his eyebrows, and it was then that George, watching his chance, would slide down the life-rail and swab his face quickly with a big red handkerchief. I never imagined that a human being could so continuously labour and so collectedly think as did Tim through that Hell's half hour when the flurry was at its worst. We were dragged hither and yon by warm or frozen suctions, belched up on the tops of wulli-was, spun down by vortices and clubbed aside by laterals under a dizzying rush of stars in the company of a drunken moon. I heard the rushing click of the midship-engine-lever sliding in and out, the low growl of the lift-shunts, and, louder than the yelling winds without, the scream of the bow-rudder gouging into any lull that promised hold for an instant. At last we began to claw up on a cant, bow-rudder and port-propeller together; only the nicest balancing of tanks saved us from spinning like the rifle-bullet of the old days.

"We've got to hitch to windward of that Mark Boat somehow," George cried.

"There's no windward," I protested feebly, where I swung shackled to a stanchion. "How can there be?"

He laughed—as we pitched into a thousand foot blow-out—that red man laughed beneath his inflated hood!

"Look!" he said. "We must clear those refugees with a high lift."

The Mark Boat was below and a little to the sou'west of us, fluctuating in the centre of her distraught galaxy. The air was thick with moving lights at every level. I take it most of them were trying to lie head to wind but, not being hydras, they failed. An under-tanked Moghrabi boat had risen to the limit of her lift and, finding no improvement, had dropped a couple of thousand.