French astronomer and author (1842–1925) who authored several notable early science fiction novels, and several works about Spiritism. ALS in French, signed “Flammarion,” one page, 5.25 x 8.25, Observatoire de Juvisy letterhead, August 6, 1893. Letter to a gentleman, in full (translated): "What price have you fixed for the sale of the illustrations of The End of the World in Belgium, and what price do you think I can ask for the text? Will they have the right to publish it also in book form after the publication in the newspaper?" In fine condition, with light toning along the bottom edge.