"I promise not to, if you will let me go."
"That's all very well, but when you get out you might break your promise."
"Then it would be for the first time," said Jasper, proudly. "I never break my promises."
"You talk well, boy, but it's easy to talk."
"It's all I can do. There is no way of proving what I say."
"That's so; and that's the reason I'm going to keep you."
"At that rate, you will have to keep me all my life."
"No; there's another way."
"What is it?" asked Jasper, eagerly.
"Join us, and when you're in the same box you won't go to blabbing."