He said that he would acquire no knowledge which did not bear upon his object. Therefore all the knowledge which he possessed was such as would be useful to him. I enumerated in my own mind all the various points upon which he had shown me that he was exceptionally well-informed. I even took a pencil and jotted them down. I could not help smiling at the document when I had completed it. It ran in this way —
SHERLOCK HOLMES — his limits.
Knowledge of Literature: Nil.
Knowledge of Philosophy: Nil.
Knowledge of Astronomy: Nil.
Knowledge of Politics: Feeble.
Knowledge of Botany: Variable. Well up in belladonna, opium, and poisons generally. Knows nothing of practical gardening.
Knowledge of Geology: Practical but limited. Tells at a glance different soils from each other. After walks has shown me splashes upon his trousers, and told me by their colour and consistence in what part of London he had received them.
Knowledge of Chemistry: Profound.
Knowledge of Anatomy: Accurate but unsystematic.
Knowledge of Sensational Literature: Immense. He appears to know every detail of every horror perpetrated in the century.
Plays the violin well.
Is an expert singlestick player, boxer, and swordsman.
Has a good practical knowledge of British law.
— Dr. Watson