Robert de MONTESQUIOU (1855-1921). Les Hortensias bleus (Paris, Bibliothèque Charpentier, 1896); in-8, contemporary vellum binding, illustrated cover and spine preserved. First edition, one of 15 copies on Hollande paper (n°5). Handsome autograph letter on the title page to pianist and composer Léon Delafosse (184-1951), whose debut was encouraged by Robert de Montesquiou and Marcel Proust: "Delafosse is like what accompanies him / Instead of a heart, he has only a piano / Hernani. [...] to Léon Delafosse/ with the gift of/ Lothecæ ac Musicæ/ and harmonic feeling/ Comte Robert de Montesquiou".