It's in End of Term, when they learn that Marie will be joining them in Lower IV A: "It was true she had every reason to dislike Marie as vividly as Lois Sanger, but somehow she didn't - perhaps because of a vague feeling that Marie was a grubby wet drip who couldn't help it, whereas Lois was far from grubby or drippish and could help it very well."
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Date: 2014-05-31 09:05 pm (UTC)ARB.