With his brother Jules, Edmond de Goncourt co-signed historical studies and numerous works of fictions theorizing the development of the naturalist esthetic. The brothers contributed to L’Éclair (1852), a newspaper run by their cousin, the Count of Villedeuil, in which Nadar also had numerous drawings published, including a panel about their first book: In 18… This led to their finding themselves in the midst of a dispute between Félix and Villedeuil that centered on a brochure and a tacit recommendation for the Pantheon from L’Éclair. The episode resulted in a challenge to a duel that never took place, in which the two brothers were meant to be their cousin’s seconds. Thus, at one point, they felt morally obliged to decline Nadar’s offer to include them. In the end, they would appear in the Pantheon, as numbers 221 and 222, from the very first edition. Nadar also crops up quite regularly in the brothers’ Journal. Edmond described the Hermitage in Sénart, still taken aback by both the photographer’s jacket and his lifestyle. In March, 1896, he would pose for a dozen snapshots by Paul Nadar.