"I've tried and tried to think of a way to use the double act, but I can't," Joe went on. "I took a couple of goldfish into the tank with Lizzie and me one day, but she gobbled them up before I could turn over. I didn't repeat that experiment."
Helen seemed to be thinking deeply. Suddenly she clapped her hands, her eyes sparkled, and she cried:
"Oh, Joe! I believe I have it!"
"Have what?"
"The solution of your trouble. I think I know a way in which you can use the goldfish and the seal in the same tank."
"How, by putting a muzzle on Lizzie?"
"No, but by using a tank with double glass sides. Let me show you what I mean!"
CHAPTER XX
ACROSS THE TRESTLE
Helen, with a pencil and piece of paper, began rapidly making a little sketch. Joe looked over her shoulder. They were in the outer section of the dressing tent, waiting for their turn to go on with their acts.