time it was traced and men got there, the telephoner was probably a mile away. He said that he would rob the same cage in the same manner as he did before."
"Aren't you taking any special precautions?"
"Oh, yes, the bank is putting on extra guards and making a lot of fuss of that sort, probably to the great amusement of the robber."
"Why not close the cage for the day?"
"Then he would rob a different one and we would have no way of photographing his actions. To be sure, we will put dummy money there, bundles with bills on the outside and paper on the inside, so if I don't get a picture of him, he won't get much. Every bill in the cage will be marked as well."
"Did he say at what time he would operate?"
"No, he didn't, so we'll have to stand by all day. Oh, hello, Casey, is everything all right?"
"As sweet as chocolate candy, Doctor. I have tested it out thoroughly, and unless we have to run it so long that the film wears out and breaks, we are sitting pretty. If we don't get the pictures you are looking for, I'm a dodo, and I haven't been called that yet."
"Good work, Casey. Keep the bearings oiled and pray that the film doesn't break."
THE bank had been opened only ten minutes when the clangor of gongs announced a robbery. It was practically a duplicate of the first. The paying teller had turned from his window to take some bills from his rack and had found several dozens of bundles missing. As the gongs sounded, Dr. Bird and Casey leaped to the camera.
"She snapped, Doctor!" cried Casey as he threw two switches. "It'll take an hour to stop and half a day to develop the film, but I ought to be able to show you what we got by to-night."
"Good enough!" cried Dr. Bird. "Go ahead while I try to calm down the bank officials. Will you have everything ready by eight o'clock?"
"Easy, Doctor," replied Casey as he turned to the magnetic brake.
By eight o'clock quite a crowd had assembled in a private room at the Blackstone Hotel. Besides Dr. Bird and Carnes, Rogers and several other officials of the First National Bank were present, together with Detective-Captain Sturtevant and a group of the most prominent scientists and physicians gathered from the schools of the city.
"Gentlemen," said Dr. Bird when all had taken seats facing a miniature moving picture screen on one wall, "to-night I expect to show you some pictures which will, I am sure, astonish you. It marks the advent of a new departure in transcendental medicine. I will be glad to answer any questions you may wish to ask and to explain the pictures after they are shown, but before we start a discussion, I will ask that you examine what I have to show you. Lights out, please!"
He stepped to the rear of the room as the lights went out. As his eyes grew used to the dimness of the room he moved forward and took a vacant seat. His hand fumbled in his pocket for a second.
"Now!" he cried suddenly.
In the momentary silence which followed his cry, two dull metallic clicks could be heard, and a quick cry that was suddenly strangled as Dr. Bird clamped his hand over the mouth of the man who sat between him and Carnes.
"All right, Casey," called the doctor.
THE whir of a projection machine could be heard and on the screen before them leaped a picture of the paying teller's cage of the First National Bank. Winston's successor was standing motionless at the wicket, his lips parted in a smile, but the attention of all was riveted on a figure who moved
