I sat up with a jerk, after contemplating the wallpaper in the television dramatisation of The Woman in White, when a character wondered aloud if he was paranoid. Paranoid? How could he be? The novel was finished by 1860 and paranoid was not invented till 1902 (in a translation of a book by the psychiatrist Emil Kraepelin) Kraepelin applied paranoid to delusions in what he called dementia praecox.