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It was a little more than an hour after our first meeting when the party, including Lockwood, who had finished his letters, gathered again up in the rooms of the Mendozas.

It was a delightful evening, even in spite of the tension on which we were. We chatted about everything from archeology to Wall Street, until I could well imagine how anyone possessed of an imagination susceptible to the influence of mystery and tradition would succumb to the glittering charm of the magic words, peje chica, and feel all the gold hunter’s enthusiasm when brought into the atmosphere of the peje grande. Visions of hidden treasure seemed to throw a glamour over everything.

Kennedy and the Senorita had moved over to a window, where they were gazing out on the fairyland of Atlantic Beach spread out before them, while Lockwood and Don Luis were eagerly quizzing me on the possibilities of newspaper publicity.

“Oh, Professor Kennedy,” I heard her say under her breath, “sometimes I fear that it is the mal de ojo –the evil eye.”

I did not catch Craig’s answer, but I did catch time and again narrowly observing Don Luis. Our host was smoking furiously now, and his eyes had even more than before that peculiar, staring look. By the way his veins stood out I could see that Mendoza’s heart action must be rapid. He was talking more and more wildly as he grew more excited. Even Lockwood noticed it and, I thought, frowned.

Slowly the conviction was forced on me. The man was mad–raving mad!

“Really, I must get back to the city tonight,” I overheard Craig say to the Senorita as finally he turned from the window toward us.

Her face clouded, but she said nothing.

“If you could arrange to have us dine with you tomorrow night up here, however,” he added quickly in a whisper, “I think I might be prepared to take some action.”

“By all means,” she replied eagerly, as though catching at anything that promised aid.

On the late train back, I half dozed, wondering what had caused Mendoza’s evident madness. Was it a sort of auto-hypnotism? There was, I knew, a form of illusion known as ophthalmophobia–fear of the eye. It ranged from mere aversion at being gazed at, all the way to the subjective development of real physical illness out of otherwise trifling ailments. If not that, what object could there be for anyone to cause such a condition? Might it be for the purpose of robbery? Or might it be for revenge?

Back in the laboratory, Kennedy pulled out from a cabinet a peculiar apparatus. It seemed to consist of a sort of triangular prism set with its edge vertically on a rigid platform attached to a massive stand.

Next he lighted one of the cigarette stubs which he had carried away so carefully. The smoke curled up between a powerful light and the peculiar instrument, while Craig peered through a lens, manipulating the thing with exhaustless patience and skill.

Finally he beckoned me over and I looked through, too. On a sort of fine grating all I could see was a number of strange lines.

“That,” he explained in answer to my unspoken question as I continued to gaze, “is one of the latest forms of the spectroscope, known as the interferometer, with delicately ruled gratings in which power to resolve the straight close lines in the spectrum is carried to the limit of possibility. A small watch is delicate, but it bears no comparison to the delicacy of these detraction spectroscopes.

“Every substance, you know, is, when radiating light, characterized by what at first appears to be almost a haphazard set of spectral lines without relation to one another. But they are related by mathematical laws and the apparent haphazard character is only the result of our lack of knowledge of how to interpret the results.”

He resumed his place at the eye-piece to check over his results. “Walter,” he said finally with a twinkle of the eye, “I wish you’d go out and find me a cat.”

“A cat?” I repeated.

“Yes–a cat–felis domesticus, if it sounds better that way, a plain ordinary cat.”

I jammed on my hat and, late as it was, sallied forth on this apparently ridiculous mission.

Several belated passers-by and a policeman watched me as though I were a house-breaker and I felt like a fool, but at last by perseverance and tact I managed to capture a fairly good specimen of the species and transported it in my arms to the laboratory without an undue number of scratches.