It had to be dragged from him.

So Whitey proceeded.
"Please explain about this fishing for gum," he said politely.
"Gum him chew," Injun replied.
"Oh, chewing-gum!" cried Whitey.

A light dawned on him, for he knew that Injun was very fond of chewing-gum.

So was Whitey.

"You trade the fish for gum." "No trade; sell 'em; get much gum." This was the first commercial instinct that Whitey had ever known Injun to show, and he looked at him admiringly.