“When shall we see them?”

“Call for me here at noon tomorrow, and we’ll go together and settle everything,” he answered.

“All right⁠—noon exactly,” said I, shaking his hand.

We left him working among his chemicals, and we walked together towards my hotel.

“By the way,” I asked suddenly, stopping and turning upon Stamford, “how the deuce did he know that I had come from Afghanistan?”

My companion smiled an enigmatical smile. “That’s just his little peculiarity,” he said. “A good many people have wanted to know how he finds things out.”

“Oh! a mystery is it?” I cried, rubbing my hands. “This is very piquant. I am much obliged to you for bringing us together. ‘The proper study of mankind is man,’ you know.”