=Maxwell=, James Clerk, birth and parentage, 279; enters Edinburgh Academy, 280; letters to his father, 280; early papers before the Royal Society of Edinburgh, 281; visit to Mr. Nicol, 281; experiments with unannealed glass, 282; enters the University of Edinburgh, 282; enters Peterhouse, 282; migrates to Trinity, 282; degree in Cambridge, 283; elected Fellow of Trinity, 284; appointed Professor at Marischal College, 284; marriage, 287; essay on Saturn's rings, 285; dynamical top, 285; appointed professor at King's College, 287; lecture on colour at the Royal Institution, 287; work on the Electrical Standards Committee, 287; appointed Professor of Experimental Physics at Cambridge, 288; plans the Cavendish Laboratory, 288; lectures at Cambridge, 290; work on the Cavendish Manuscripts, 134, 293; delivers the Rede Lecture, 293; method of protecting buildings from lightning, 294; death, 294; colour-top, 295; experiments on colour-blindness, 296; colour-box, 297; awarded the Rumford Medal, 297; wheel of life, 297; real-image spectroscope, 298; discovery of stresses in Canada balsam, 298; of the insensibility of the _fovea centralis_ to blue light, 298; statistical method, 299; explanation of the viscosity of gases, 299; investigations of Faraday's lines of force, 300; statement of the laws of electro-magnetic induction, 301; mechanical illustration of the ether, 302; explanation of induced currents, 304; of the mechanical action between currents and currents, and between magnets and currents, 304; of self-induction, 306; electro-magnetic theory of light, 306; contrivance for overcoming the principle of the dissipation of energy, 328. Maxwell's experiment for showing electro-magnetic rotation, 258. Mayer's determination of the mechanical equivalent of heat, 323. Mechanical equivalent of heat, definition of, 193; Rumford's determination of, 192. Mercury, melting point of, 145. Mirabeau's declamation on Franklin, 123. Mixed plates, colours of, 223. Moral perfection, Franklin's endeavour to attain, 56. Mother-of-pearl, Young's explanation of the colours of, 224. N. Nautical Almanack, Young appointed superintendent of the, 232. Newton's analysis and synthesis of white light, 213; rings, Young's explanation of, 222; theory of light, 219. Nicol prisms given to Clerk Maxwell, 282. O. [OE]rsted's discovery, 255. Ohm's law, discovered by Cavendish, 143; meaning of, 143. Optical glass, Faraday's work on, 259. Otto von Guericke, contributions of, to electricity, 3; experiments of, with the Magdeburg hemispheres, 17. P. Paris, Dr., Faraday's letter to, 243.