The fair sex is your department.

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

You know how easily and suddenly these things happen, beginning in playful teasing and ending in something a little warmer than friendship. You squeeze the slender arm which is passed through yours, you venture to take the little gloved hand, you say good night at absurd length in the shadow of the door. It is innocent and very interesting, love trying his wings in a first little flutter.

He [Professor Moriarty] is the Napoleon of crime, Watson. He is the organizer of half that is evil and of nearly all that is undetected in this great city. He is a genius, a philosopher, an abstract thinker. He has a brain of the first order.

Steel True, Blade Straight.

Every man finds his limitations, Mr. Holmes, but at least it cures us of the weakness of self-satisfaction.

By the way, Doctor, I shall want your cooperation.' 'I shall be delighted.' 'You don't mind breaking the law?' 'Not in the least.' 'Nor running a chance of arrest?' 'Not in a good cause.' 'Oh, the cause is excellent!' 'Then I am your man.' 'I was sure that I might rely on you.