"Gum?"
"You see, chummy, the wentilation is poor in 'ere. There's a green mildew on my floor and the bloomin' spiders is too silent to be sociable company. But you never 'eard me 'ollerin', Bobbs."
Indeed, he always lay low during the outbreaks. His methods were more secretive. He was the villain by trade.
"But my sympathy is with the bloomin' mutineers hall the time. So I pick away with my rat's tooth w'en the others is 'ollerin' and even green little hinnocent Bobbs cawn't 'ear me."
The rasping sound illustrated his meaning.
"Ee won't trust me, but Hi trust 'im. We'll see who can keep a secret, and who leaks."
There was a sound as if something had been slid out of the wall on the other side and of a sudden Dobbs' whisper became startlingly distinct.
"Honly a few minutes, Bobbs. Hi 'old the plaster in my pockets, and the rat's tooth in my fingers w'ile Hi gnaw and gnaw." The tool began working rapidly and dexterously. In a short time Dobbs spoke again:
"Tap 'em till you feel it 'ollow, and shove on the 'ollow spot."
Robert tapped the wall.