“Possibly you are thinking of the connection between insanity and phases of the moon?”

“No, I assure you. It was quite a different line of thought. Possibly you can leave your notebook with me, and I will check the dates. Now I think, Watson, that our line of action is perfectly clear. This young lady has informed us⁠—and I have the greatest confidence in her intuition⁠—that her father remembers little or nothing which occurs upon certain dates. We will therefore call upon him as if he had given us an appointment upon such a date. He will put it down to his own lack of memory. Thus we will open our campaign by having a good close view of him.”

“That is excellent,” said Mr. Bennett. “I warn you, however, that the professor is irascible and violent at times.”