“Well, I should back the crocodile.”

“Why?”

“Well, dear, the crocodile has great teeth and would eat the zebu.”

“But suppose the zebu came up when the crocodile was not looking and butted it.”

“Well, that would be one up for the zebu. But one butt wouldn’t hurt a crocodile.”

“No, one wouldn’t, would it? But the zebu would keep on. Crocodiles live on sand-banks, don’t they? Well, then, the zebu would come and live near the sandbank too—just so far as the crocodile would never see him. Then every time the crocodile wasn’t looking the zebu would butt him. Don’t you think he would beat the crocodile?”

“Well, perhaps he would.”

“How long do you think it would take the zebu to beat the crocodile?”

“Well, it would depend upon how often he got in his butt.”

“Well, suppose he butted him once every three hours, don’t you think—?”