The Terror
tree that stood out against the sky; and yet he knew that he was listening to some sound that he could not determine or define. It was not the wind in the leaves, it was not the gentle wash of the water of the sea against the rocks; that latter sound he could distinguish quite easily. But there was something else. It was scarcely a sound; it was as if the air itself trembled and fluttered, as the air trembles in a church when they open the great pedal pipes of the organ.
The doctor listened intently. It was not an illusion, the sound was not in his own head, as he had suspected for a moment; but for the life of him he could not make out whence it came or what it was. He gazed down into the night over the terraces of his garden, now sweet with the scent of the flowers of the night; tried to peer over the treetops across the sea towards the Dragon's Head. It struck him suddenly that this strange fluttering vibration of the air might be the noise of a distant aeroplane or air-
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