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 on a 5.5 x 3.5 postcard, postmarked December 13, 1900. Untranslated letter to social psychologist Gustave Le Bon. Addressed on the reverse in his own hand. In fine condition.
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