Note 272 — Chapter III · The Influence of Race and Heredity on Genius and Insanity.

The same kind of influence may be traced among the insane and degenerate. A son of Louis XIV. and Madame de Montespan, conceived during a crisis of remorse and grief, at the epoch of the Jubilee, was called “l’enfant du jubilé,” on account of his condition of permanent melancholy. A man of talent, subject to attacks of mental exaltation, had several children, of whom two, conceived during these attacks, were insane. Déjerine, L’Hérédité dans les Maladies du Système Nerveux, 1886.