Once more there came sailing through the air a paper "cannon ball." It fell on the ground between Laddie and Russ and burst open, a lot of dry, soft sand spilling out.
"There!" cried Laddie. "See! I didn't throw 'em!"
"No, I don't guess you did," admitted Russ. "But who did?"
Just then a jolly laugh sounded, and out from behind a ridge of