Note: Wikipedia lists six books, with some comment, no book or series article (2020-04-18): • Coffee and Repartee (1893) • The Idiot (1895) • The Idiot at Home (1900) • The Inventions of the Idiot (1904) • The Genial Idiot: His Views and Reviews (1908) • Half Hours with the Idiot (1917) – interior images (Archive.org)