To meet unusual conditions the people individually and collectively rose to heights of forgotten ingenuity. The physical life of a city is so well established that the average city dweller grows out of the pioneer virtue of adaptability. Now once more these people were forced to meet new and untried conditions, to guard against new dangers, new opposing forces. In an incredibly short s.p.a.ce of time they grew out of aimless panic. They learned to sit tight; to guard adequately their lives, their treasure, and even to a certain extent their time against undue loss.

In the meantime the moneyed powers had been prompt to act. They did not intend to stand idly while their pockets were being picked by untoward circ.u.mstances; nor did they intend to continue indefinitely the unusual expenditures necessary to guard themselves against even a greater loss. As there seemed to be two men to find, they employed the best of detectives to search for McCarthy; and professor Eldridge, as the greatest living expert, to hunt down the Unknown. Thus unexpectedly Eldridge found himself with definite backing in his strange duel with Darrow.

It is now desirable to place before the reader samples of the messages sent by Monsieur X and received in the wireless office of the Atlas Building, after which we can proceed once more to follow out the sequence of events.

"TO THE PEOPLE: The sign has been sent you. You must now believe.

The traitor is among you, and you must hunt him down. This is your sacred duty, for I, your master, have laid it upon you."

That was one of the first. After a round dozen of similar import, there came this:

"TO THE PEOPLE: I, your master, am displeased with you. The visitations of darkness and of silence have been sent, but you have heeded little. I doubt not that ye search, as I have commanded, but you do not realize to the full your sacred obligation. You go about your business and you carry on your affairs. Your business and your affairs are not so important as these, my commands. Beware lest you draw down the wrath of the Lord's Anointed. I am patient with your ignorance; but give heed."

The last at present to which your attention is called came just before the events to be detailed:

"TO THE PEOPLE: Your time is drawing short. You are a stubborn and a stiff-necked generation. My patience is ebbing away. You have been shown the power of my right hand, and you have gone your accustomed ways. You have defied the might of the Right Hand of G.o.d. Now I will lay on you my commands.

"You must seek out Apollyon and deliver him even into my hands, and that shortly. I shall be patient yet a little while longer, for I know that you grope in darkness and have not the light that shines upon me. But soon I shall strike."

CHAPTER XVI

THE PROFESSOR'S EXPERIMENT

Throughout all this excitement Percy Darrow did absolutely nothing. He spent all his time, save that required for meals and the shortest necessary sleep, in a round-armed wooden chair in the wireless station of the Atlas Building. Jack Warford sat with him. Darrow rarely opened his mouth for speech, but smoked slowly a few cigarettes, and rolled many more, which he held unlighted in the corner of his mouth until they dropped to pieces. He watched quietly all that went on; glanced through such messages as came in from Monsieur X, read the papers, and dozed. To reporters he was affable enough in his drawling slow fashion, but had nothing to say.

"Eldridge is doing this," he said to them; "I'm only in the position of an interested spectator."

Eldridge had taken hold in a thoroughly competent way. Back of the cold precision of his undoubted scientific attainments lurked, unexpected by most, a strong ambition and a less admirable hankering for the lime-light.

His opportunity to gratify all these appet.i.tes--science, advancement, and fame--was too good not to cause him the deepest satisfaction.

"I have determined," he told the reporters, "that this particular instrument alone receives the messages from the unknown perpetrator. Our investigations must be initiated, therefore, in this apartment."

"How do you explain it?" asked one of the reporters.

"I can not explain it scientifically," admitted Eldridge, "but I can surmise that the fact either purposely or accidentally has to do either with this instrument's location or with some slight and undetermined peculiarity of its tuning."

"You could easily tell which by moving the instrument to another station where they aren't getting the messages now," suggested Darrow lazily.

"Certainly," snapped Eldridge, "any child could deduce that. But I fail to see the use or necessity for the determination at all unless in a spirit of frivolous play. Our task is not to discover where the messages can be received, but whence they are sent."

He gazed frostily at the man who had interrupted him. Darrow smiled softly back.

"How far will your instrument carry in sending?" Eldridge asked Simmons.

"Its extreme is about two hundred miles."

"Then we can safely a.s.sume that a circle drawn with a two-hundred-mile radius would contain this man you call Monsieur X"--the newspapers had adopted Darrow's nickname for the Unknown--"since you have succeeded in communicating with him."

"Marvelous," said Darrow to Jack--but under his breath.

"As the sending of Monsieur X is faint, it follows that he is somewhere near the periphery of this circle, or that he is possessed of a primitive or weak instrument. By the doctrine of probabilities we should be justified in concluding against the latter supposition."

"How's that, Professor?" asked the _Morning Register_ man. "It doesn't get to me."

"He is evidently a man not only of scientific attainments, but of immense scientific possessions--as is evidenced by these phenomenal results he is able to accomplish. But we are not justified in reasoning according to the doctrine of probabilities. Therefore, we shall proceed methodically. I have already made my preparations."

Eldridge looked about him with an air of triumph.

"I am fortunate enough to have, in the present crisis, unlimited financial backing," he said. "Therefore, I am in a position to carry out the most exhaustive of experiments."

He stretched his hand out for a long roll, which he laid flat upon the table, pinning down the corners.

"Here is a map of the Eastern States," said he. "I have drawn a circle on it with a two-hundred-miles radius. At this moment a private instrument with a full crew to string sending and receiving wires is two hundred miles from here on the New York Central Railroad. It has for its transportation a private train, and it will be given a clear right of way." He turned to Simmons. "Have you found yourself able to communicate with this Monsieur X at any time?"

"Communicate!" echoed Simmons. "Why, he's easier to talk to than a girl who wants an ice-cream soda!"

"Then send this: 'Your messages have been communicated to the people. Be patient.'"

Simmons touched the key. The spark leaped crashing.

"What do you get?" asked Eldridge, after a moment.

"Oh, a lot of the same sort of dope," answered Simmons wearily. "Do you want it?"

"No, it is not necessary," replied Eldridge. "But listen for another message from about the same distance when he has finished."

Silence fell on the room. At the end of ten minutes Simmons raised his head.

"I get 'O K Q' over and over," said he. "Want that?"

"That," replied Eldridge with satisfaction, "indicates that my crew on the special train in the Adirondacks two hundred miles away has heard your message to Monsieur X." He glanced at his watch. "Now, if you would be so good as to afford me a moment's a.s.sistance," he requested Simmons, "I wish to disconnect from your battery one of your powerful Leyden jars, and to subst.i.tute for it one of weaker voltage. I ventured to instruct my delivery man to leave a few in the outer hall."

"That will weaken the sending power of my instrument," objected Simmons.

"Exactly what I wish to do," replied Eldridge.

"He's clever all right," Darrow murmured admiringly to Jack. "See what he's up to?"

"Not yet," muttered Jack.

The subst.i.tution completed, Eldridge again glanced at his watch.

"Now," he instructed Simmons, "send the letters 'Q E D,' and continue to do so until you again hear the letters 'O K Q.'"

Simmons set himself to the task. It was a long one. At last he reported his answer.