Geary, and disappears through the door which a foot-high pneumatic compressor locks after him.

"A-ah!" sighs the compressor released. Our holding-down clips part with a tang. We are clear.

Captain Hodgson opens the great colloid underbody-porthole through which I watch million-lighted London slide eastward as the gale gets hold of us. The first of the low winter clouds cuts off the well-known view and darkens Middlesex. On the south edge of it I can see a postal packet's light ploughing through the white fleece. For an instant she gleams like a star ere she drops toward the Highgate Receiving Towers. "The Bombay Mail," says Captain Hodgson, and looks at his watch. "She's forty minutes late."

"What's our level?" I ask.

"Four thousand. Aren't you coming up on the bridge?"

The bridge (let us ever bless the G. P. O. as a repository of ancientest tradition!) is represented by a view of Captain Hodgson's legs where he stands on the control platform that runs thwartships overhead. The bow colloid is unshuttered and Captain Purnall, one hand on the wheel, is feeling for a fair slant. The dial shows 4,300 feet.

"It's steep to-night," he mutters, as tier on tier of cloud drops under. "We generally pick up an easterly draught below three thousand at this time o' the year. I hate slathering through fluff."

"So does Van Cutsem. Look at him huntin' for a slant!" says Captain Hodgson. A fog-light breaks cloud a hundred fathoms below. The Antwerp Night Mail makes her signal and rises between two racing clouds far to port, her flanks blood-red in the glare of Sheerness Double Light. The gale will have us over the North Sea in half an hour, but Captain Purnall lets her go composedly—nosing to every point of the compass as she rises.

"Five thousand—six, six thousand eight hundred"—the dip-dial reads ere we find the easterly drift, heralded by a flurry of snow at the thousand-fathom level. Captain Purnall rings up the engines and keys down the governor on the switch before him. There is no sense in urging machinery when Æolus himself gives you good knots for nothing. We are away in earnest now—our nose notched home on our chosen star. At this level the lower clouds are laid out all neatly combed by the dry fingers of the East. Below that again is the strong westerly blow through which we rose. Overhead, a film of southerly drifting mist draws a theatrical gauze across the firmament. The moonlight turns the lower strata to silver without a stain except where our shadow underruns us. Bristol and Cardiff Double Lights (those statelily inclined beams over Severnmouth) are dead ahead of us; for we keep the Southern Winter Route. Coventry Central, the pivot of the English system, stabs upward once in ten seconds its spear of diamond light to the north; and a point or two off our starboard bow The Leek, the great cloud-breaker of Saint David's Head, swings its unmistakable green beam twenty-five degrees each way. There must be half a mile of fluff over it in this weather, but it does not affect The Leek.

"Our planet's overlighted if anything," says Captain Purnall at the wheel, as Cardiff-Bristol slides under. "I remember the old days of common white verticals that 'ud show two or three thousand feet up in a mist, if you knew where to look for 'em. In really fluffy weather they might as well have been under your hat.