"And what do you call it?"

"It's a piece of the God-Stone."

"You're mad."

"Then what do you say it is?"

"That's a trouser-button."

"A what?"

"A trouser-button."

"How do you make that out?"

"A trouser-button with the shaft broken off, a button of the sort which the niggers in the Sahara wear. I've a whole set of them."

"Prove it, damn you!"