"Not a single thing," said Patty, firmly.

"How mean you are!"

"There's the tea bell," said Patty. "You'd better decide quickly, because I can't wait."

"Suppose we promise only to read books out of the library," began Ella, "and light the gas sometimes?"

"Good-night!" replied Patty, turning this time as if she really meant to go.

"We'll promise! We'll promise!" cried the three shivering figures on the roof.

"Everything?"

"Yes, if you like."

"On your honour?"

"On our honour."