Preparatory Work, 1841–1850
1841. Joule: Thermogenic Effects of the Electric Current. Herschel: Philosophy of the Inductive Sciences. List: Das nationale System der politischen Ökonomie. 1842. R. Mayer: Erhaltung der Energie. R. Wagner: Handwörterbuch der Physiologie. A. Comte: Cours de philosophie positive. L. Feuerbach: Wesen des Christentums. 1843. J. S. Mill: Inductive Logic. Matteucci: Discovery of the Nerve-Current. 1844. Faraday: Electrical Conduction and the Nature of Matter. 1845. Discovery of the Electrical Incandescent Lamp. 1846. W. Weber: Electrodynamic Measurements. Discovery of Anæsthesia by Ether. 1847. Helmholtz: Die Erhaltung der Kraft (Conservation of Energy). Discovery of Anæsthesia by Chloroform. 1848. Quetelet: Du système social. Dubois-Reymond: Animal Electricity. Discovery of Gold in California. 1849. Discoveries of Bacillus of Anthrax and of Aniline Dyes. 1850. Herbert Spencer: Social Statics (Identity of Laws of Organic and Social Evolution).