The scientist sniffed. Yes, it was unmistakably a sniff. He left her suddenly and went to the other stenographer. Precisely the same thing happened; standing close to her he asked one question, and at her answer sniffed. Miss Clarke passed through the outer office to mail a letter. She, too, had to answer the question as the scientist squinted into her eyes, and sniffed.
"Ah," he said, at her answer.
Then from one to another of the employees of the bank he went, asking each a few questions. By this time a murmur of amusement was running through the office. Finally The Thinking Machine approached the cage in which sat Dunston, the receiving teller. The young man was bent over his work, absorbed.
"How long have you been employed here?" asked the scientist, suddenly.
Dunston started and glanced around quickly.
"Five years," he responded.
"It must be hot work," said The Thinking Machine. "You're perspiring."
"Am I?" inquired the young man, smilingly.
He drew a crumpled handkerchief from his hip pocket, shook it out, and wiped his forehead.
"Ah!" exclaimed The Thinking Machine, suddenly.
He had caught the faint, subtle perfume of violets--an odor identical with that on the handkerchief found in front of the safe.
III.
The Thinking Machine led the way back to the private office of the cashier, with President Fraser, Cashier West and Hatch following.
"Is it possible for anyone to overhear us here?" he asked.
"No," replied the president. "The directors meet here."
"Could anyone outside hear that, for instance?" and with a sudden sweep of his hand he upset a heavy chair.
"I don't know," was the astonished reply. "Why?"
The Thinking Machine went quickly to the door, opened it softly and peered out. Then he closed the door again.
"I suppose I may speak with absolute frankness?" he inquired.
"Certainly," responded the old banker, almost startled. "Certainly."
"You have presented an abstract problem," The Thinking Machine went on, "and I presume you want a solution of it, no matter where it hits?"
"Certainly," the president again assured him, but his tone expressed a grave, haunting fear.
"In that case," and The Thinking Machine turned to the reporter, "Mr. Hatch, I want you to ascertain several things for me. First, I want to know if Miss Clarke uses or has ever used violet perfume--if so, when she ceased using it."
"Yes," said the reporter. The bank officials exchanged wondering looks.
"Also, Mr. Hatch," and the scientist squinted with his strange eyes straight into the face of the cashier, "go to the home of Mr. West, here, see for yourself his laundry mark, and ascertain beyond any question if he has ever, or any member of his family has ever, used violet perfume."
The cashier flushed suddenly.
"I can answer that," he said, hotly. "No."
"I knew you would say that," said The Thinking Machine, curtly. "Please don't interrupt. Do as I say, Mr. Hatch."
Accustomed as he was to the peculiar methods of this man, Hatch saw faintly the purpose of the inquiries.
"And the receiving teller?" he asked.
"I know about him," was the reply.
Hatch left the room, closing the door behind him. He heard the bolt shot in the lock as he started away.
"I think it only fair to say here, Professor Van Dusen," explained the president, "that we understand thoroughly that it would have been impossible for Mr. West to have had anything to do with or know----"
"Nothing is impossible," interrupted The Thinking Machine.
"But I won't----" began West, angrily.
"Just a moment, please," said The Thinking Machine. "No one has accused you of anything. What I am doing may explain to your satisfaction just how your handkerchief came here and bring about the very thing I suppose you want--exoneration."
The cashier sank back into a chair; President Fraser looked from one to the other. Where there had been worry on his face there was now only wonderment.
"Your handkerchief was found in this office, apparently having been dropped by the persons who blew the safe," and the long, slender fingers of The Thinking Machine were placed tip to tip as he talked. "It was not there the night before. The janitor who swept says so; Dunston, who happened to look, says so--; Miss Clarke and Dunston both say they saw you with a handkerchief as you left the bank. Therefore, that handkerchief reached that spot after you left and before the robbery was discovered."
The cashier nodded.
"You say you don't use perfume; that no one in your family uses it. If Mr. Hatch verifies this, it will help to exonerate you. But some person who handled that handkerchief after it left your possession and before it appeared, here did use perfume. Now who was that person? Who would have had an opportunity?
"We may safely dismiss the possibility that you lost the handkerchief, that it fell into the hands of burglars, that those burglars used perfume, that they brought it to your bank--your own bank, mind you!--and left it. The series of coincidences necessary to bring that about would not have occurred once in a million times."
The Thinking Machine sat silent for several minutes, squinting steadily at the ceiling.
"If it had been lost anywhere, in the laundry, say, the same rule of coincidence I have just applied would almost eliminate it. Therefore, because of an opportunity to get that handkerchief, we will assume--there is--there must be--some one employed in this bank who had some connection with or actually participated in the burglary."
The Thinking Machine spoke with perfect quiet, but the effect was electrical. The aged president staggered to his feet and stood staring at him dully; again the flush of crimson came into the face of the cashier.
"Some one," The Thinking Machine went on, evenly, "who either found the handkerchief and unwittingly lost it at the time of the burglary, or else stole it and deliberately left it. As I said, Mr. West seems eliminated. Had he been one of the robbers, he would not wittingly have left his handkerchief; we will still assume that he does not use perfume, therefore personally did not drop the handkerchief where it was found."
"Impossible! I can't believe it, and of my employees----" began Mr. Fraser.
"Please don't keep saying things are impossible," snapped The Thinking Machine. "It irritates me exceedingly. It all comes to the one vital question: Who in the bank uses perfume?"
"I don't know," said the two officials.
"I do," said The Thinking Machine. "There are two--only two, Dunston, your receiving teller, and Miss Clarke."
"But they----"
"Dunston uses a violet perfume not _like_ that on the handkerchief, but _identical_ with it," The Thinking Machine went on. "Miss Clarke uses a strong rose perfume."
"But those two persons, above all others in the bank, I trust implicitly," said Mr. Fraser, earnestly. "And, besides, they wouldn't know how to blow a safe. The police tell me this was the work of experts."
"Have you, Mr. Fraser, attempted to raise, or have you raised lately, any large sum of money?" asked the scientist, suddenly.
"Well, yes," said the banker, "I have. For a week past I have tried to raise ninety thousand dollars on my personal account."
"And you, Mr. West?"
The face of the cashier flushed slightly--it might have been at the tone of the question--and there was the least pause.
"No," he answered finally.
"Very well," and the scientist arose, rubbing his hands; "now we'll search your employees."
"What?" exclaimed both men. Then Mr. Fraser added: "That would be the height of absurdity; it would never do. Besides, any person who robbed the bank would not carry proofs of the robbery, or even any of the money about with them--to the bank, above all places."
"The bank would be the safest place for it," retorted The Thinking Machine. "It is perfectly possible that a thief in your employ would carry some of the money; indeed, it is doubtful if he would dare do anything else with it. He could see you would have no possible reason for suspecting anyone here--unless it is Mr. West."
There was a pause. "I'll do the searching, except the three ladies, of course," he added, blushingly. "With them each combination of two can search the other one."
Mr. Fraser and Mr. West conversed in low tones for several minutes.
"If the employees will consent I am willing," Mr. Fraser explained, at last; "although I see no use of it."
"They will agree," said The Thinking Machine. "Please call them all into this office."
Among some confusion and wonderment the three women and fourteen men of the bank were gathered in the cashier's office, the outer doors being locked. The Thinking Machine addressed them with characteristic terseness.
"In the investigation of the burglary of last night," he explained, "it has been deemed necessary to search all employees of this bank." A murmur of surprise ran around the room. "Those who are innocent will agree readily, of course; will all agree?"
There were whispered consultations on all sides. Dunston flushed angrily; Miss Clarke, standing near Mr. Fraser, paled slightly. Dunston looked at her and then spoke.
"And the ladies?" he asked.