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 and flint-pails and make castles for us to live in. That's thousands of years ago, but I hear that children still build castles on the sand. It's difficult to break yourself of a habit."

"But why did you stop living in the castles?" asked Robert.

"It's a sad story," said the Psammead gloomily. "It was because they would build moats to the castles, and the nasty wet bubbling sea used to come in, and of course as soon as a Sand-fairy got wet it caught cold, and generally died. And so there got to be fewer and fewer, and, whenever you found a fairy and had a wish, you used to wish for a Megatherium, and eat twice as much as you wanted, because it might be weeks before you got another wish."

"And did you get wet?" Robert inquired.

The Sand-fairy shuddered. "Only once," it said; "the end of the twelfth hair of my top left whisker—I feel the place still in damp weather. It was only once, but it was quite enough for me. I went away as soon as the