The Adventures of Sherlock Holmes

by Arthur Conan Doyle

You may remember the old Persian saying, ‘There is danger for him who taketh the tiger cub, and danger also for whoso snatches a delusion from a woman.’ There is as much sense in Hafiz as in Horace, and as much knowledge of the world.”

Singularity is almost invariably a clue. The more featureless and commonplace a crime is, the more difficult it is to bring it home.

“Well, moonshine is a brighter thing than fog,”

as I said then, that a man should keep his little brain-attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber-room of his library, where he can get it if he wants it.

“My God! It’s Watson,” said he. He was in a pitiable state of reaction, with every nerve in a twitter.

An interesting early use of @Twitter...

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.”

magnifying lens.

First reference to Holmes with a magnifying lens in print that I've seen.