“Oh yes, I know, I remember now; I’ve learned that,” said Susan hastily, for she did not wish Sophia Jane to think her quite ignorant. “It has something to do with the moon.”

“The moon!” exclaimed Sophia Jane with utter disdain in her voice, “you’re muddling things up.”

“It has,” repeated Susan positively, “it’s in the geography book.”

“I don’t believe it,” said Sophia Jane.

“I wonder,” said Susan half to herself, with her eyes fixed on the sea, “what prevents it from running right over all the land.”

Sophia Jane shrugged her shoulders.

“That is a thing no one understands,” she said, “so it’s no use to bother about it.” Then with a sudden sharp glance to the left, “There goes Monsieur La Roche.”

Susan looked round and saw a tall thin figure just hurrying round a corner, but she had time to recognise it before it disappeared; it was the kind French gentleman.

“He’s the French master,” continued Sophia Jane; “such a silly old thing. We all laugh at him.”

“Why?” asked Susan.