"I wish Doctor Morgan were here; I ought to have sent for him, I suppose," said Lambert, a few minutes later. "Will you allow me to get him? I cannot seem to perfect this last stage."

"No time, now," declared Phillips. "I said till midnight."

It was obvious to Lambert that the detective had become certain during the course of the evening that the scientist was mad. The ceaseless fiddling and the lack of results or even spectacular sights had convinced Phillips that he had to do with a crank.

"I think I have it now," said Lambert coolly.

"What?" asked Phillips.

"The original combination. I had forgotten one detail in the excitement, and this threw me off. Now I believe I will succeed--in one way or another. I warn you, be careful. I am about to release forces which may get out of my control."

"Well, now, don't get reckless," begged Phillips nervously. The array of machines had impressed him, even if Lambert did seem a fool.

"You insist upon remaining, so it is your own risk," said Lambert coolly.

Lambert, in the strange robes, was a bizarre figure. The hood was thrown back, exposing his pale, black-bearded face, the wan eyes with dark circles under them, and the twitching lips.

"If you find yourself leaving this vale of tears," went on the scientist, ironically, to the sleuth, "you will at least have the comfort of realizing that as the sound-force disintegrates your mortal form you are among the first of men to be attuned to the vibrations of the unknown sound world. All matter is vibration; that has been proven. A building of bricks, if shaken in the right manner, falls into its component parts; a bridge, crossed by soldiers in certain rhythmic time, is torn from its moorings. A tuning fork, receiving the sound vibrations from one of a similar size and shape begins to vibrate in turn. These are homely a.n.a.logies, but applied to the less familiar sound vibrations, which make up our atomic world, they may help you to understand how the terrific forces I have discovered can disintegrate flesh."

The scientist looked inquiringly at Phillips. As the sleuth did not move, but sat with folded arms, Lambert shrugged and said, "I am ready."

Lambert raised his hood, and Phillips said, in a spirit of bravado, "You can't scare me out of here."

"Here goes the switch," cried Lambert.

He made the contact, as he had before. He stood for a moment, and this time the current gained force. The experimenter pushed his lever all the way over.

A 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 position, 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--"

In the heart of nothingness was Lambert, his body torn and racked in a shrieking chaos of sound and a blinding glare of iridescent light which seemed too much to bear.

His last conscious thought was a prayer, that, having failed to bring back his sweetheart, Madge Crawford, he was undergoing a step toward the same destination to which he had sent her.

John Lambert came to with a shudder. But it was not a mortal shudder.

He could sense no body; had no sense of being confined by matter. He was in a strange, chilly place--a twilight region, limitless, without dimensions.

Yet he could feel something, in an impersonal way, vaguely indifferent. He had no pain now.

He was moving, somehow. He had one impelling desire, and that was to discover Madge Crawford. Perhaps it was this thought which directed his movements.

Intent upon finding the girl, if she was indeed in this same strange world that he was, he did not notice for some time--how long, he had no way of telling--that there were other beings which tried to impede his progress. But as he grew more accustomed to the unfamiliar sensations he was undergoing, he found his path blocked again and again by queer beings.

They were living, without doubt, and had intelligence, and evinced hostility toward him. But they were shapeless, shapeless as amoebas.

He heard them in a sort of soundless whisper, and could see them without the use of eyes. And he shuddered, though he could feel no body in which he might be confined. Still, when he pinched viciously with invisible fingers at the spot where his face should have been, a twinge of pain registered on the vague consciousness which appeared to be all there was to him.

He was not sure of his substance, though he could evidently experience human sensations with his amorphous body. He did not know whether he could see; yet, he was dodging this way and that, as the beings who occupied this world tried to stop him.

They gave him the impression of gray shapes, and in coppery shadows things gleamed and closed in on him.

He seemed to hear a cry, and he knew that he was receiving a call for help from Madge Crawford. He tried to run, pushed determinedly toward the spot, impelled by his love for the girl.

Now, as he hurried, he occasionally was stopped short by collision with the formless shapes which were all about him. He was hampered by them, for they followed him, making a sound like wind heard in a dream. Whatever medium he was in was evidently thickly inhabited by the hostile beings who claimed this world as their own. Though he could not actually feel the medium, he could sense that it was heavy.

He leaped and ran, fighting his way through the increasing hosts, and the roar of their voice-impressions increased in his consciousness.

Yet there seemed to be nothing, nothing tangible save vagueness. He felt he was in a blind spot in s.p.a.ce, a place of no dimensions, no time, where beings abhorred by nature, things which had never developed any dimensional laws, existed.

The cry for help struck him, with more force this time. Lambert, whatever form he was in, realised that he was close to the end of his journey to Madge Crawford.

He tried to speak, and had the impression that he said something rea.s.suring. He then b.u.mped into some vibrational being which he knew was Madge. His ears could not hear, nor could his flesh feel, but his whole form or cerebrum sensed he held the woman he loved in his arms.

And she was speaking to him, in accents of fear, begging him to save her.

"John, John, you have come at last. They have been torturing me terribly. Save me."

"Darling Madge, I will do everything I can. Now I have found you, and we are together and will never part. Can you hear me?"

"I know what you are thinking, and what you wish to say. I can't exactly hear; it all seems vague, and impossible. Yet I can suffer.

They have been hitting me with something which makes me shudder and shake--there, they are at it again."

Lambert felt the sensations, now, which the girl had made known to him. He felt crowded by gray beings, and his existence was troubled by spasms of pain-impressions. He knew Madge was crying out, too.