From time to time as I looked at him, he caught my eye and instantly averted his own, turning rather red. Apparently he was a shy, nervous man, which might account for his giggling; for I have noticed that shy or nervous people have a habit of smiling inopportunely and even giggling when embarrassed by meeting an over-steady eye. And it seemed my own eye had this disconcerting quality, for even as I looked at him, the document suddenly went up again and began to shake violently.

I stood it for a minute or two, but, finding the situation intolerably embarrassing, I rose, and brusquely excusing myself, went up to the laboratory to look for Polton and inquire at what time Thorndyke was expected home. To my surprise, however, on entering, I discovered Thorndyke himself just finishing the mounting of a microscopical specimen.

“Did you know that there is someone below waiting to see you?” I asked.

“Is it anyone you know?” he inquired.