But the monoplane was doggedly following suit; as the Parrott rose, so did the Valkyr, if a trace more slowly and less flexibly.
Lanyard had read somewhere, or heard it said, that monoplanes were poor machines for climbing. He told himself that, if this were true, Vauquelin knew his business; and from this reflection drew what comfort he might.
And he was glad, very glad of the dark wind-veil that shrouded his face, which he believed to be nothing less than a mask of panic terror.
He was, in fact, quite rigid with fright and horror. It were idle to argue that only unlikely chance would wing one of the bullets from the Valkyr to a vital point: there was the torn canvas overhead, there was that hole through Vauquelin's sleeve….
And then the barograph on the strut beside Lanyard disappeared as if by magic. He was aware of a slight jar; the framework of the biplane quivered as from a heavy blow; something that resembled a handful of black crumbs sprayed out into the air ahead and vanished: and where the instrument had been, nothing remained but an iron clamp gripping the strut.
And even as any one of these bullets might have proved fatal, their first successor might disable the aviator if it did not slay him outright; in either case, the inevitable result would be death following a fall from a height, as recorded on the barograph dial an instant before its destruction, of more than four thousand feet.
They were still climbing….
Now the pursuer was losing some of the advantage of his superior speed; the Parrott was perceptibly higher; the Valkyr must needs mount in a more sweeping curve.
None the less, Lanyard, peering down, saw still another tongue of flame spit out at him; and two bullet-holes appeared in the port-side wings of the biplane, one in the lower, one in the upper spread of canvas.
White-lipped and trembling, the adventurer began to work at the fastenings of his surtout. After a moment he plucked off one of his gloves and cast it impatiently from him. A-sprawl, it sailed down the wind like a wounded sparrow. He caught Vauquelin's eye upon him, quick with a curiosity which changed to a sudden gleam of comprehension as Lanyard, thrusting his hand under the leather coat, groped for his pocket and produced an automatic pistol which Ducroy had pressed upon his acceptance.