He produced various essays on the World War, and his latest novels include La Vermine du Monde (1916); Le Bonheur d'etre Riche (1917); Le Coeur et l'Absence (1917) and Dans la Lumiere (1919).
Popular and Family Reviews.-A travers le monde (1898); Femina (1901); Je sais tout (1905); La Lecture moderne (1901); La Revue hebdomadaire (1892); Les Lectures pour tous (1898); Mon bonheur (1902); La Vie heureuse (1902).
The ethics of these principles were worked out in Discours sur le bonheur, La Volupte, and L' Art de jouir, in which the end of life is found in the pleasures of the senses, and virtue is reduced to self-love.
Women have been decorated, notably Rosa Bonheur, Madame Curie and Madame Bartet.
The mathematical dream seems to have produced nothing; his poetical ambitions resulted in the poem called Le Bonheur (published posthumously, with an account of Helvetius's life and works, by C. F.