"To the Blackstone Hotel for a bath and some clean clothes," replied the doctor. "And now, what is the news you have for me?"

"The news is this, Doctor. I carried out your instructions diligently and, during the daylight hours, the lions have not moved."

Dr. Bird looked contrite.

"I beg your pardon, Carnes," he said. "I really didn't think when I left you so mystified how you must have felt. Believe me, I had my own reasons, excellent ones, for secrecy."

"I have usually been able to maintain silence when asked to," replied Carnes stiffly.

"My dear fellow, I didn't mean to question your discretion. I know that whatever I tell you is safe, but there are angles to this affair that are so weird and improbable that I don't dare to trust my own conclusions, let alone share them. I'll tell you all about it soon. Did you get those tickets I wired for?"

"Of course I got them, but what have two tickets to the A. A. U. track meet this afternoon got to do with a bank robbery?"

"One trouble with you, Carnes," replied the doctor with a judicial air, "is that you have no idea of the importance of proper relaxation. Is it possible that you have no desire to see Ladd, this new marvel who is smashing records right and left, run? He performs for the Illinois Athletic Club this afternoon, and it would not surprise me to see him lower the world's record again. He has already lowered the record for the hundred yard dash from nine and three-fifths to eight and four-fifths. There is no telling what he will do."

"Are we going to waste the whole afternoon just to watch a man run?"

demanded Carnes in disgust.

"We will see many men run, my dear fellow, but there is only one in whom I have a deep abiding interest, and that is Mr. Ladd. Have you your binoculars with you?"

"No."

"Then by all means beg, borrow or steal two pairs before this afternoon.

We might easily miss half the fun without them. Are our seats near the starting line for the sprints?"

"Yes. The big demand was for seats near the finish line."

"The start will be much more interesting, Carnes. I was somewhat of a minor star in track myself in my college days and it will be of the greatest interest to me to observe the starting form of this new speed artist. Now Carnes, don't ask any more questions. I may be barking up the wrong tree and I don't want to give you a chance to laugh at me.

I'll tell you what to watch for at the track."

The sprinters lined up on the hundred yard mark and Dr. Bird and Carnes sat with their gla.s.ses glued to their eyes watching the slim figure in the colors of the Illinois Athletic Club, whose large "62" on his back identified him as the new star.

"On your mark!" cried the starter. "Get set!"

"Ah!" cried Dr. Bird. "Did you see that Carnes?"

The starting gun cracked and the runners were off on their short grind.

Ladd leaped into the lead and rapidly distanced the field, his legs twinkling under him almost faster than the eye could follow. He was fully twenty yards in the lead when his speed suddenly lessened and the balance of the runners closed up the gap he had opened. His lead was too great for them, and he was still a good ten yards in the lead when he crossed the tape. The official time was posted as eight and nine-tenths seconds.

"Another thirty yards and he would have been beaten," said Carnes as he lowered his gla.s.ses.

"That is the way he has won all of his races," replied the doctor. "He piles up a huge lead at first and then loses a good deal at the finish.

His speed doesn't hold up. Never mind that, though, it is only an additional point in my favor. Did you notice his jaws just before the gun went?"

"They seemed to clench and then he swallowed, but most of them did some thing like that."

"Watch him carefully for the next heat and see if he puts anything into his mouth. That is the important thing."

Dr. Bird sank into a brown study and paid no attention to the next few events, but he came to attention promptly when the final heat of the hundred yard dash was called. With his gla.s.ses he watched Ladd closely as the runner trotted up to the starting line.

"There, Carnes!" he cried suddenly. "Did you see?"

"I saw him wipe his mouth," said Carnes doubtfully.

"All right, now watch his jaws just before the gun goes."

The final heat was a duplicate of the first preliminary. Ladd took an early lead which he held for three-fourths of the distance to the tape, then his pace slackened and he finished only a bare ten yards ahead of the next runner. The time tied his previous world's record of eight and four-fifths seconds.

"He crunched and swallowed all right, Doctor," said Carnes.

"That is all I wanted to be sure of. Now Carnes, here is something for you to do. Get hold of the United States Commissioner and get a John Doe warrant and go back to the hotel with it and wait for me. I may phone you at any minute and I may not. If I don't, wait in your room until you hear from me. Don't leave it for a minute."

"Where are you going, Doctor?"

"I'm going down and congratulate Mr. Ladd. An old track man like me can't let such an opportunity pa.s.s."

"I don't know what this is all about, Doctor," replied Carnes, "but I know you well enough to obey orders and to keep my mouth shut until it is my turn to speak."

Few men could resist Dr. Bird when he set out to make a favorable impression, and even a world's champion is apt to be flattered by the attention of one of the greatest scientists of his day, especially when that scientist has made an enviable reputation as an athlete in his college days and can talk the jargon of the champion's particular sport.

Henry Ladd promptly capitulated to the charm of the doctor and allowed himself to be led away to supper at Bird's club. The supper pa.s.sed off pleasantly, and when the doctor requested an interview with the young athlete in a private room, he gladly consented. They entered the room together, remained for an hour and a half, and then came out. The smile had left Ladd's face and he appeared nervous and distracted. The doctor talked cheerfully with him but kept a firm grip on his arm as they descended the stairs together. They entered a telephone booth where the doctor made several calls, and then descended to the street, where they entered a taxi.

"Maywood airdrome," the doctor told the driver.

Two hours later the big Martin bomber which had carried the doctor to Chicago roared away into the night, and Bird turned back, reentered the taxi, and headed for the city alone.

When Carnes received the telephone call, which was one of those the doctor made from the booth in his club, he hurried over to the First National Bank. His badge secured him an entrance and he found Casey busily engaged in rigging up an elaborate piece of apparatus on one of the balconies where guards were normally stationed during banking hours.

"Dr. Bird said to tell you to keep on the job all night if necessary,"

he told Casey. "He thinks he will need your machine to-morrow."

"I'll have it ready to turn on the power at four A.M.," replied Casey.

Carnes watched him curiously for a while as he soldered together the electrical connections and a.s.sembled an apparatus which looked like a motion picture projector.

"What are you setting up?" he asked at length.

"It is a high speed motion picture camera," replied Casey, "with a telescopic lens. It is a piece of apparatus which Dr. Bird designed while he was in Washington last week and which I made from his sketches, using some apparatus we had on hand. It's a dandy, all right."

"What is special about it?"