“It is very good of Lord St. Simon to honour my head by putting it on a level with his own,” said Sherlock Holmes, laughing. “I think that I shall have a whisky and soda and a cigar after all this cross-questioning. I had formed my conclusions as to the case before our client came into the room.”

“My dear Holmes!”

“I have notes of several similar cases, though none, as I remarked before, which were quite as prompt. My whole examination served to turn my conjecture into a certainty. Circumstantial evidence is occasionally very convincing, as when you find a trout in the milk, to quote Thoreau’s example.”

“But I have heard all that you have heard.”