sound of a second gun came like an answer. And then he saw the monoplane on Blackheath was running down its guides to launch. It lifted clean and rose. It shot up into the air, driving straight southward and away from him.
In an instant it came to him what this meant. It must needs be Ostrog in flight. He shouted and dropped towards it. He had the momentum of his elevation and fell slanting down the air and very swiftly. The other machine rose steeply at his approach. He allowed for its velocity and drove straight upon it.
It suddenly became a mere flat edge, and behold! he was past it, and driving headlong down with all the force of his futile blow.
He was furiously angry. He reeled the engine back along its shaft and went circling up. He saw Ostrog's machine beating up a spiral before him. He rose straight towards it, won above it by virtue of the impetus of his swoop and by the advantage and weight of a man. He dropped headlong—dropped and missed again! As he rushed past he saw the face of Ostrog's aeronaut confident and cool and in Ostrog's attitude a wincing resolution. Ostrog was looking steadfastly away from him—to the south. He realised with a gleam of wrath how bungling his flight must be. Below he saw the Croydon hills. He jerked upward and once more he gained on his enemy.
He glanced over his shoulder and his attention was arrested. The eastward stage, the one on Shooter's Hill, appeared to lift; a flash changing to a tall grey shape, a cowled figure of smoke and dust, jerked into
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