And as soon as they felt that thrill in the deep of the marshes the will-o'-the-wisps soared up from their fathomless homes, and waved their lights to beckon the traveller on, over the quaking mosses at the hour when the duck were flighting. And under that whirr and rush and rejoicing of wings that the ducks make in that hour the traveller followed after the waving lights, further and further into the marshes. Yet sometimes he turned from them, so that for a while they followed him, instead of leading as they were accustomed to do, till they could get round in front of him and lead him once more. A watcher, if there had been one in such bad light and in such a perilous place, had noticed after a while in the venerable traveller's movements a queer resemblance to those of the hen green plover when she lures the stranger after her in Spring, away from the mossy bank where her eggs lie bare. Or perhaps such a resemblance is merely fanciful, and a watcher might have noticed no such thing. At any rate on that night in that desolate place there was no watcher whatever. And the traveller followed his curious course, sometimes towards the dangerous mosses, sometimes towards the safe green land, always with grave demeanour and reverent gait; and the will-o'-the-wisps in multitudes gathered about him. And still that deep thrill that warned the marsh of a stranger throbbed on through the ooze below the roots of the rushes; and did not cease, as it should as soon as the stranger was dead, but haunted the marsh like some echo of music that magic has made everlasting, and troubled the will-o'-the-wisps even over the border in Elfland. Now it is far from my intention to write anything detrimental to will-o'-the-wisps, or anything that may be construed as being a slight upon them: no such construction should be put upon my writings. But it is well known that the people of the marshes lure travellers to their doom, and have delighted to follow that avocation for centuries, and I may be permitted to mention this in no spirit of disapproval. The will-o'-the-wisps then that were about this traveller redoubled their efforts with fury; and when still he eluded their last enticements only on the very edge of the deadliest pools, and still lived and still travelled, and the whole marsh knew of it, then the greater will-o'-the-wisps that dwell in Elfland rose up from their magical mire and rushed over the border. And the whole marsh was troubled.