“The same thing!” Dickey cried, seizing it. “So Morse had it, too, after he became checker at scale No. 3, where the cheating is, if anywhere. The very thing Landers started to explain to me, and how they cheated the customs with it. I say, we must have it now, Rentland! We need only go to the docks and watch them while they weigh, and see how they use it, and arrest them and then we have them at last, eh, old man?” he cried in triumph. “We have them at last!”

“You mean,” Trant cut in upon the customs man, “that you can convict and jail perhaps the checker, or a foreman, or maybe even a dock superintendent—as usual. But the men higher up—the big men who are really at the bottom of this business and the only ones worth getting—will you catch them?”

“We must take those we can get,” said Dickey sharply.

Trant laid his hand on the little officer’s arm.

“I am a stranger to you,” he said, “but if you have followed some of the latest criminal cases in Illinois perhaps you know that, using the methods of modern practical psychology, I have been able to get results where old ways have failed. We are front to front now with perhaps the greatest problem of modern criminal catching, to catch, in cases involving a great corporation, not only the little men low down who perform the criminal acts, but the men higher up, who conceive, or connive at the criminal scheme. Rentland, I did not come here to convict merely a dock foreman; but if we are going to reach anyone higher than that, you must not let Inspector Dickey excite suspicion by prying into matters at the docks this afternoon!”

“But what else can we do?” said Rentland, doubtfully.

“Modern practical psychology gives a dozen possible ways for proving the knowledge of the man higher up in this corporation crime,” Trant answered, “and I am considering which is the most practicable. Only tell me,” he demanded suddenly; “Mr. Welter I have heard is one of the rich men of New York who make it a fad to give largely to universities and other institutions; can you tell me with what ones he may be most closely interested?”

“I have heard,” Rentland replied, “that he is one of the patrons of the Stuyvesant School of Science. It is probably the most fashionably patroned institution in New York; and Welter’s name, I know, figures with it in the newspapers.”

“Nothing could be better!” Trant exclaimed. “Kuno Schmalz has his psychological laboratory there. I see my way now, Rentland; and you will hear from me early in the afternoon. But keep away from the docks!” He turned and left the astonished customs officers abruptly. Half an hour later the young psychologist sent in his card to Professor Schmalz in the laboratory of the Stuyvesant School of Science. The German, broad-faced, spectacled, beaming, himself came to the laboratory door.

“Is it Mr. Trant—the young, apt pupil of my old friend, Dr. Reiland?” he boomed, admiringly. “Ach! luck is good to Reiland! For twenty years I, too, have shown them in the laboratory how fear, guilt, every emotion causes in the body reactions which can be measured. But do they apply it? Pouf! No! it remains to them all impractical, academic, because I have only nincompoops in my classes!”