“Yes, sir, it is a crushing blow,” said the old man. “That is my magnum opus ⁠—the pile of papers on the side table yonder. It is my analysis of the documents found in the Coptic monasteries of Syria and Egypt, a work which will cut deep at the very foundation of revealed religion. With my enfeebled health I do not know whether I shall ever be able to complete it, now that my assistant has been taken from me. Dear me! Mr. Holmes, why, you are even a quicker smoker than I am myself.”

Holmes smiled.

“I am a connoisseur,” said he, taking another cigarette from the box⁠—his fourth⁠—and lighting it from the stub of that which he had finished. “I will not trouble you with any lengthy cross-examination, Professor Coram, since I gather that you were in bed at the time of the crime, and could know nothing about it. I would only ask this: What do you imagine that this poor fellow meant by his last words: ‘The professor⁠—it was she’?”