"I have it!" cried Nat suddenly.
"What, the same thing as Bismark?" shouted Joe, "here somebody, hold him down."
"No, I know what's the matter with him-loco weed!"
He stooped down and picked up a small, bright green trefoil leaf. Cal slapped his leg with an exclamation as he looked at it.
"That's right, boy. That's loco weed, sure. It's