When you have eliminated all which is impossible, then whatever remains, however improbable, must be the… — Arthur Conan Doyle

"Of course I remembered him," said I as I laid down the letter. "Big Bob Ferguson, the finest three-quarter Richmond ever had. He was always a good-natured chap. It's like him to be so concerned over a friend's case."

Holmes looked at me thoughtfully and shook his head. "I never get your limits, Watson," said he. "There are unexplored possibilities about you. Take a wire down, like a good fellow. 'Will examine your case with pleasure.'"

--"Your case!"

--"We must not let him think that this agency is a home for the weak-minded."

Dogs don't make mistakes.

We must look for consistency. Where there is a want of it we must suspect deception.