Nothing clears up a case so much as stating it to another person.

I should be very much obliged if you would slip your revolver into your pocket. An Eley's No. 2 is an excellent argument with gentlemen who can twist steel pokers into knots. That and a tooth-brush are, I think, all that we need.

I think there are certain crimes which the law cannot touch, and which therefore, to some extent, justify private revenge.

Detection is, or ought to be, an exact science, and should be treated in the same cold and unemotional manner.

Crime is common. Logic is rare. Therefore it is upon the logic rather than upon the crime that you should dwell.

Detection is, or ought to be, an exact science, and should be treated in the same cold and unemotional manner. You have attempted to tinge it with romanticism, which produces much the same effect as if you worked a love-story or an elopement into the fifth proposition of Euclid.

You know my methods. Apply them.