Three publication dates for each book are given because, in the system developed by
Pierre-Jules Hetzel for the
Voyages Extraordinaires, each of Verne's novels was published successively in several different formats. This resulted in several distinct editions of each texts, as follows. •
Serial (known as
éditions pré-originales, pre-original editions): Serialization in a periodical, usually Hetzel's own biweekly ''Magasin d'Éducation et de récréation'' ("Magazine of Education and Recreation", founded 1864). The serialized installments were illustrated by artists on Hetzel's staff, such as
Édouard Riou,
Léon Benett, and
George Roux. •
In-18 (
éditions originales, original editions): complete unillustrated texts published in book form at
in-18 (
18mo) size. (Similar versions in the slightly larger
12mo size, with illustrations taken from the serialization, are also considered
éditions originales.) This edition is almost always the first book-format printing; the one exception is
Claudius Bombarnac, which was first published in a grand-in-8º edition. •
In-8 (
cartonnages dorés et colorés, gilded and colored bindings): Complete editions of the text, published in
grand in-8º ("large
octavo") book form with a lavishly decorated cover. These deluxe editions, designed for Christmas and New Year's markets, include most or all of the illustrations from the serializations.
Published in Verne's lifetime Posthumous additions The posthumously published volumes in the
Voyages Extraordinaires were extensively altered, and in some cases entirely written, by Verne's son
Michel. The original versions of the novels were published later by the Jules Verne Society in 1985 and 1999 with their original titles. ==Other novels==