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It was almost dawn before Craig and I left the laboratory after his discovery of the manner of the stramonium poisoning. I was thoroughly tired, though not so much so that my dreams were not haunted by a succession of baleful eyes peering at me from the darkness.

I slept late, but Kennedy was about early at the laboratory, verifying his experiments and checking over his results, carefully endeavoring to isolate any other of the closely related mydriatic alkaloids that might be contained in the noxious fumes of the poisoned tobacco. Though he was already convinced of what was going on, I knew that he considered it a matter of considerable medico-legal importance to be exact, for if the affair ever came to the stage of securing an indictment, the charge could be sustained only by specific proof.

Early in the forenoon Kennedy left me alone in the laboratory and made a trip downtown, where he visited a South American tobacco dealer and placed a rush order for a couple of hundred cigarettes, duplicating in shape and quality those which Senor Mendoza doza preferred, except, however, the deadly drug which was in those he was smoking.

I had some writing to do and was busily engaged at my typewriter when I suddenly became conscious of that feeling of being watched. Perhaps I had heard a footstep outside and did not remember it, but at any rate I had the feeling. I stopped tapping the keys suddenly and wheeled about in my chair just in time to catch a glimpse of a face dodging back from the window. I don’t think that I would be prepared to swear just who it was, but there was just enough that was familiar about the fleeting glimpse of the eyes to make me feel uncomfortable.

I ran to the door, but it was too late. The intruder had disappeared. Still, the more I thought about it, the more determined I was to verify my suspicions, if possible. I put on my hat and walked over to the registrar’s office. Sure enough, Alfonso de Moche was registered in the summer school as well as in the regular course. I was now fully convinced that it was he who had been watching us.

Not satisfied, I determined to make further inquiries about the young man. He had been at the University that morning, I learned from one of his professors, and that convinced me more than ever that he had employed at least a part of the time in spying on us. As I had expected, the professor told me that he was an excellent student, though very quiet and reserved. His mind seemed to run along the line of engineering and mining, especially, and I could not help drawing the conclusion that perhaps he, too, was infected by the furore for treasure hunting, in spite of his Indian ancestry.

Nothing further occurred, however, during the day to excite suspicion and Craig listened with interest, though without comment, when I related what had happened. He divided his time during the rest of the day between some experimental work of his own and fits of deep reverie in which he was evidently trying to piece together the broken strands of the strange story in which we were now concerned.

The package of cigarettes which he had ordered was delivered late in the afternoon. Kennedy had already wrapped up a small package of a powder and filled a small atomizer with some liquid. Stowing these things away in his pockets as best he could, with a little vial which he shoved into his waistcoat pocket, he announced that he was ready at last to take an early train to Atlantic Beach.

We dined that night, as Craig had requested, with the Mendozas and Lockwood up in the sitting-room of Don Luis’s suite. It was a delightfully situated room, overlooking the boardwalk and the ocean, and the fresh wind that was wafted in from the water made it quite the equal of a roof garden.