The Four Classical Years of Positivism, 1857–1860.
1857. Bunsen: Exact Methods for the Analysis of Gases. Morel: Traité des Dégénérescences. Marx: Materialist Conception of History. Buckle: History of Civilization. Tocqueville: La Révolution et l’Ancien Régime. Flaubert: Madame Bovary. 1858. Virchow: Cellularpathologie. M. Schiff: Lehrbuch der Physiologie.