---- polarity, 192, 210 Diamagnetism, Discovery of, 186 Dielectric medium, 153, 159, 163 Diploma-book, 271 Discharge, electric, Forms of, 137, 162 ---- ----, Dark, 162 Discoveries, Value of, 63, 224, 248 Displacement currents, 166 Doctrine of conservation of energy, 167, 219 ---- of correlation of forces, 172, 269, 270 ---- of electrons, 148 Domestic affairs, 49, 69, 244, 257 Doubtful knowledge, Aversion for, 46, 92 Dry rot in timber, 149 Dumas: Reminiscences by, 20, 59, 240; and Arago’s copper, 106; discovery of oxalamide, 137 E. Eddy-currents, Effects due to, 107, 191, 204 Education, Views on, 278 Eel, The electric, 167 Electric light for lighthouses, 218, 269 Electrical machine, Faraday’s own, 6 ---- ----, The “new,” 121 Electrochemical laws, 141, 147 Electrodes, 143 Electrolysis, 143 Electrolytes, 143 Electromagnetic rotations discovered, 51, 83, 87 Electromagnetism, Foundations of, 77 Electrons, Doctrine of, 148 Electrotonic state, 116, 126, 166, 215 Elocution, Lessons in, 43, 230 Enthusiasm, 15, 89, 225, 240 Ether, The (_see_ ÆTHER) Evolution of electricity from magnetism, 108, 114 Examinations in chemistry, 277 Experiment, Love of, 117, 230, 276 ---- the touchstone of hypothesis, 221 ---- _versus_ mathematics, 117, 239, 280 Experimental researches in electricity and magnetism: the first series, 113; the last series, 216; Clerk Maxwell on, 218 Expert work, 51, 61, 63, 274 Explosions in the laboratory, 94 F. Faraday, James, 1, 2, 224