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work yet．”
“Yes，”said Digory．“And get caught by Uncle Andrew and have our rings taken away before we’ve had any fun．No thanks．”
“Couldn’t we just go part of the way down into our own pool，”said Polly．“Just to see if it works．Then if it does，we’ll change rings and come up again before we’re really back in Mr. Ketterley’s study．”
“Can we go part of the way down ？”
“Well，it took time coming up．I suppose it’ll take a little time going back．”
Digory made rather a fuss about agreeing to this，but he had to in the end because Polly absolutely refused to do any exploring in new worlds until she had made sure about getting back to the old one．She was quite as brave as he about some dangers（wasps， for instance）but she was not so interested in finding out things nobody had ever heard of before；for Digory was the sort of person who wants to know everything，and when he grew up he became the famous Professor Kirke who comes into other books．
After a good dea
