“Our case is proved, I think!” The psychologist turned from the two who stared with hate at the cringing spy, and again faced his clients.

He unlocked the door, and handed the key to Munikov; then, picking up his instrument cases and record sheets, with Miss Silber and his clients he left the room and entered the landlady’s sitting room.

CHAPTER V. AN INTRUSION OF SCIENCE.

“When I received Mr. Edwards’ letter this morning,” Trant said, in answer to the questions that showered upon him, “it was clear to me at once that the advertisement he inclosed depended for its appeal on reminding Eva Silber of some event of prime importance to herself, but also, from the wording employed, of popular or national significance as well. You further told me that October 30th was a special holiday with Miss Silber. That, I found, to be the date of the czar’s manifesto of freedom and declaration of amnesty to political prisoners. At once it flashed upon me: Eva Silber was a Russian. The difference between the seventeenth given in the advertisements and the thirtieth—thirteen days—is just the present difference between the old-style calendar used in Russia and ours.

“Before going to the Crerar Library, then, it was clear that we had to do with a Russian revolutionary intrigue,” he went on. “At the library I obtained the key to the cipher and translated the advertisement, obtaining the name of Meyan and his address, and also the name and address of Dmitri Vasili, a well-known revolutionary writer. To my surprise, Vasili knew nothing of any revolutionist named Meyan. It was inconceivable that a revolutionary emissary should come to Chicago and he not know of it. It became necessary to find Meyan immediately.

“My first direct clew was the hammering that we heard in this house. It was too much to suppose that in two separate instances this hammering should be heard, and in each case Eva’s father he present and no other discoverable agent, and that still he should have nothing to do with it. Obviously, it must have been Herman Silber who did the hammering at Eva’s home and here in this house. It was obvious, too, that Herman Silber was the ‘your own’ of the advertisement.

“To test Meyan, whom we found in the saloon, was not difficult,” said Trant. “I arranged to have him overhear some one speaking of an arrest at Warsaw, which would at once suggest itself as a hotbed of Russian revolutionists to either a revolutionist or a police agent; but the idea would certainly give positive and very 

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