"I'll say it very quick," murmured the Other Professor, with downcast eyes, and melancholy voice, which contrasted oddly with his face, as he had forgotten to leave off smiling. ("At least it wasn't exactly a smile" as Sylvie said afterwards: "it looked as if his mouth was made that shape.")
"Go on then," said the Professor. "What must be must be."
"Remember that!" Sylvie whispered to Bruno, "It's a very good rule for whenever you hurt yourself."
"And it's a very good rule for whenever I make a noise," said the saucy little fellow. "So you remember it too, Miss!"
"Whatever do you mean?" said Sylvie, trying to frown, a thing she never managed particularly well.
"Oftens and oftens," said Bruno, "haven't oo told me 'There mustn’t be so much noise, Bruno!' when I've tolded oo 'There must!' Why, there isn't no rules at all about 'There mustn't'! But oo never believes me!"
"As if any one could believe you, you wicked wicked boy!" said Sylvie. The words were
