"I'll go after the world's record before the season is over," he said to Helen.

"I hope you make it," she said.

"One thing bothers me, though," said Joe. "I can't use the goldfish in the tank when I act with Lizzie. She'd do nothing but eat them. And it's quite a bother to have to take the fish out every time just before I let Lizzie go into the water. I could have two tanks, I suppose, doing part of my act in one with the goldfish, and then changing to another with the seal. But I have enough duffle to cart about as it is.

I don't want another big tank."

"No, it would be a nuisance," agreed Helen.

"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 gla.s.s 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.

"See," Helen explained, "you can easily put double gla.s.s sides on your tank by slipping sheets of gla.s.s inside the four present outer sides, leaving a s.p.a.ce of five or six inches between them. Fill this s.p.a.ce with water, and put the goldfish in that. Then they can swim around, and Lizzie can't get at them because they'll be protected by the gla.s.s."

She made a sectional view of the tank with its double sides and held it up triumphantly to Joe.

"Will that solve the puzzle?" she asked.

"Why, I really believe it will!" exclaimed Joe, after a moment's thought. "Yes, I could have metal clips, made water-tight with rubber, fitted inside the tank. Taking five inches off each side wouldn't mean much loss. Then I could slip four sheets of gla.s.s down in the metal clips, and, as you say, fill the intervening s.p.a.ce with water for the goldfish."

"Exactly," cried Helen. "The audience can't tell whether the fish are in the tank with you or not, for the water and gla.s.s, being transparent, will make it look exactly as if you and the fish and the seal were in the same bit of water."

"Good!" cried Joe. "I'll do it! The very thing, Helen!"

The fact that persons looking directly at a gla.s.s tank of water can not tell how far back the water and tank extends is taken advantage of by moving picture operators in producing novel effects. Only the other day was shown a scene where a man apparently went down to the bottom of a river. Fish swam all about him, there was a portion of a wreck half buried in the sand and mud, and waving aquatic plants seemed to reach out and twine themselves around the man, while fish swam above and below him.

This effect was produced by having the man go through certain actions behind a square gla.s.s tank in which the sand, aquatic plants, wreck and fish had been placed. The fish could swim about, but the man was not in the water at all but behind the tank, the water and gla.s.s offering no obstruction to the camera.

It was that principle which Helen suggested to Joe. He and the seal would be doing their act behind a gla.s.s and water screen, in which fish were swimming and aquatic plants gently waving.

Joe lost no time in putting the plan into operation. He ordered the gla.s.s and metal holding clips, with the water-tight rubber gaskets, from the same firm in New York that had originally made Benny's tank.

They still had the patterns, and knew just the proper size and kind of gla.s.s to send, and Joe had no difficulty in malting his tank a double one.

The experiment was tried in private one afternoon just before the performance. The plants and goldfish were put in the thin outer tank which extended all around the inner one. The fish, of course, swam about as they were in the habit of doing. The fact that they were in a much more restricted s.p.a.ce did not seem to perplex or vex them.

Then Joe got into the inner tank, and Lizzie was allowed to follow him.

No sooner did the seal see herself surrounded by the fish she loved to eat than she made a dash for a big golden one.

Of course Lizzie b.u.mped her nose against the protecting gla.s.s, but this did not deter her. Joe watched the sea-lion curiously. Again she made a dash for a fish, evidently thinking she had not been quick enough to get the first one. Again came a painful b.u.mp.

Joe continued to swim about as he always did when Lizzie was in the tank. It was not until after her third failure that the intelligent seal began to think something was wrong. Then she swam alongside the inner gla.s.s. Just beyond, three-quarters of an inch away, but as secure as though the s.p.a.ce were miles, swam the goldfish. Lizzie could not get them, and then she turned her big eyes on Joe as if to ask what sort of trick this was to play on a good, performing seal.

If Joe had not been under water he would have laughed. He did this when he came up, however, and he gave Lizzie more than her usual allowance of common fish to make up for her disappointment over the gold ones.

But Helen's solution of the problem was perfect. The circus folk formed a critical rehearsal audience and as Joe swam about in the inner tank with the seal, and as the goldfish flitted about in the outer tank, Jim Tracy said:

"It couldn't be better. The illusion is perfect. No one looking at it as the crowd will view it, could tell but that it was all one tank.

Helen, you're a fine suggester. First I know, you'll be going into business for yourself."

"Not while I have Rosebud," she answered, blushing. "But I'm glad my plan worked."

Joe was glad also. Not only was he enabled to get a much more spectacular effect by having the goldfish and his seal in the same act, but it saved a lot of work in taking out the fish every time he wanted to perform with Lizzie. And as it had been necessary to take the goldfish out twice a day--for the afternoon and night performance--much work was entailed. And there is so much to do, anyhow, in moving a circus from place to place, that everything which makes for economy of time or motion is very welcome and eagerly adopted.

That afternoon the audience seemed to appreciate very much the aquatic act. It certainly made a pretty scene with Joe, in his red scaly suit, going through all manner of performances in the water, while the dark seal swam in and out, sometimes circling around his head, again darting through his looped arms, while on all sides they were surrounded by goldfish and gracefully waving green gra.s.s and plants.

It was one of the showiest acts in the circus, and taking advantage one day of a particularly gracious reception on the part of the crowd, and when he had lengthened his stay under water by two seconds, Joe asked for more money.

Jim Tracy whistled in mild surprise, but he did not make half the objections he had made on the other occasion.

"I'm under a lot more expense," Joe explained. "Lizzie cost me money, and I have to buy fish for her every day. Besides, the extra tank fittings cost considerable."

"All right, Joe. I'm not making any kick," said the ring-master.

"You're certainly worth a lot to us, and we can't afford to lose you. I wouldn't say that to every performer, or they'd get such a swelled head that there'd be no doing anything with them. But you're different, I'm glad to say. Yes, you shall have more money. The act is worth it, especially since you got Lizzie. First you know you'll be a millionaire, my boy."

"Not in this business, I guess," laughed Joe.

Joe found himself liking more and more his motor-cycle rides. Helen, too, enjoyed them very much. She was even learning to manage the machine herself, though, as yet, she had not ventured to drive it at more than a slow speed, and then on some little-frequented road.

As soon as the circus reached a town where it was to show, and Joe and Helen had had their breakfast, and had seen, one to his tank and seal and the other to her horse, they would set off for a ride through the beautiful country. It took them away from the atmosphere of the circus, and rested them mentally and physically. They were in better trim for the strenuous and exacting work that was to follow.

Helen had greatly elaborated her act since the time when Joe had first seen it. She had taken a little dog--the same one that had refused to act with Joe in the tank--and had trained it to ride with her on Rosebud's back. The dog did some simple tricks, and that, with the beautiful and intelligent horse and Helen, who herself was strikingly pretty, made an act that always was well applauded.

"I only hope you two don't have a break-down when you're out on the road motor-cycling some day," said Jim Tracy. "If you do, and don't get back to the show on time--well, I don't know what I'll do."

Joe had not thought of that, and thereafter he was careful not to go too far away, so, in case of some accident to the machine, he could hire a horse and wagon to bring him and Helen back. But the machine had not yet given him trouble and he hoped it would not.

"I'm very glad I bought it from Babson," he said, "though the day I got it and the seal I seemed to be going it pretty heavy in the matter of expenditures."