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256 and he seemed quite pleased to be taken to see the caves. He pointed out that the removal of the simple dam would send the water back into the old channel. It would be perfectly simple to have the brickwork knocked out, and to let the stream find its way back, if it could, to its old channel, and thence down the arched way which Edred and Elfrida told him they were certain was under a mound below the Castle.

"You know a lot about it, don't you?" he said good-humouredly.

"Yes," said Edred simply.

Then they all went down to the mound, and the engineer then poked and prodded it and said he should not wonder if they were not so far out. And then Beale and another man came with spades, and presently there was the arch, as good as ever, and they exclaimed and admired and went back to the caves.

It was a grand moment when the bricks had been taken out and daylight poured into the cave, and nothing remained but to break down the dam and let the water run out of the darkness into the sunshine. You can imagine with what mixed feelings the children wondered whether they would rather stay in the cave and see the dam demolished, or stay outside and see the stream rush out. In the end the boys stayed within, and it was only Elfrida and her father who saw the stream emerge. They sat on a hillock among the thin harebells and wild thyme and sweet lavender-coloured gipsy