Kennedy leaned over and swept up the ashes of Whitney's cigarettes which lay in the ash-tray, placing them, stubs and all, in an envelope, as he had done before.

"We have one sample, already," he said. "Another won't hurt. You can never have too much material to work with. Let us see where he is going."

Slowly we followed in the direction which Whitney had taken from the cafe. There was Whitney standing by the cigar-stand, gazing intently down the corridor.

Kennedy and I moved over so that we could see what he was gazing at. Just then he started to walk hurriedly in the direction in which he was looking.

"Senora de Moche!" exclaimed Craig, drawing me toward a palm.

It was indeed she. She had left the tea room and gone to her own room. Now she was alighting from the elevator, and had started toward the main dining-room, when her eyes had rested on Whitney. In spite of all that he had said to us about her, he had received the glance as a signal and was fluttering over to her like a moth to a flame.

What was the reason back of it all, I asked, as I thought of those wonderful eyes of hers? 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 action from an otherwise trivial objective cause. Perhaps Inez was right about the eyes. One might fear them, and that fear might cause the precise thing to happen which the owner of the eyes intended. Still, as I reflected before, there was a much more important problem regarding eyes before us, that of the drug that was evidently being used in the cigarettes. What was it?

There was no chance of our gleaning anything now from these two who made such a strange pair. Kennedy turned and went out of the nearest entrance of the hotel.

"Central Park, West," he directed a cab driver, as we climbed in his machine; then to me, after giving the number, "I must see Inez Mendoza again before I can go ahead."

Inez was not expecting us so soon after leaving her at the hotel, yet I think was just a little glad that we had come.