terrible greenish-blue light suddenly illuminated the laboratory, and through the air there came sound vibrations which seemed to tear at Phillips' body. He found himself on the floor, knocked from his chair, and he writhed this way and that, speechless, suffering a torment of agony. His whole flesh seemed to tremble in unison with the waves which emanated from the machines which Lambert manipulated.

After what seemed hours to the suffering sleuth, the force diminished, and soon Phillips was able to rise. Trembling, the detective cursed and yelled for help in a high-pitched voice.

Lambert had thrown back his hood, and was rocking to and fro in agony.

"Madge, Madge," he cried, "what have I done! Come back to me, come back!"

Doherty and the others came running in at their chief's shouts. "Arrest him," ordered Phillips shakily. "I've stood enough of this nonsense."

The detectives started for Lambert. He saw them coming, and swiftly threw off the protective garments he wore.

"Stand back!" he cried, and threw the switch all the way over. The verditer green light smashed through the air, and the queer sound sensations smacked and tore them; Doherty, who had drawn a revolver when he was answering Phillips' cries, fired the gun into the air, and the report seemed to battle with the vibrating ether.

Lambert, as he threw the switch, leaped forward and landed on the metal plate under the ceiling studs, in the very center of the awful disturbance and unprotected from its force.

For a few moments, Lambert felt racking pain, as though something were tearing at his flesh, separating the very atoms. The scientist saw the wriggling figures of the sleuths, in various strange positions, but his impressions were confused. His head whirled round and round, he swayed to and fro, and, finally, he thought he fell down, or rather, that he had melted, as a lump of sugar dissolves in water.

"He's gone—gone—"