SUBJECT INDEX 



387 



Heat, quantity of, 127 



Heat, radiant, Scheele's experi- 

 ments with, 143 



Heredity, Mendelian principle of, 

 321 



Hydrochloric acid gas, discovery 



of, 145 

 Hydrodynamics, 48, 94 

 Hydrogen, discovery of, 146 

 Hydrostatics, 3, 23 

 Hygrometer, dew-point, 183 



Inclined plane, laws of, 21 



Induction, electromagnetic (Fara- 

 day), 252 fF.; electrostatic, 156 



Inertia, 79; law of, 27; moment of, 

 86 



Infinitesimal Calculus, 93 



Influence machine, electrical, 157 



Infusorise, 310 



Inquisition, 7; and Galileo, 34 



Insects, metamorphosis of, 310 



Interference of light (Fresnel), 205 



Intuition of genius, 27 



Inverse squares, law of, 109, 158 



Ions, migration of, 348 



Joule-Thomson effect, 305 

 Jupiter, 31, 66, 89 



Kosmos (Humboldt), 187 



Laughing gas, 192 



Leyden jar, 156 



Life-force, 310 



Light, 2, 40, 45; drag, 212; electro- 

 magnetic theory of, 264; emis- 

 sion and absorption of, Kirch- 

 off's law for, 328, 351; emission 

 theory of, 106; pressure of, 349; 

 radiation of, 325; velocity of, 66, 

 125, 264, 376, and electro- 

 dynamics, 264; wave theory of, 

 80, 196 f. 



Lines of force (Faraday), 254 f., 

 257; (Maxwell), 342 



Living organisms, transformation 

 of energy in, 277, 314 



Lodestone, 153 



Lunar Society, 145 



Machines, 3, 20 



Magdeburg hemispheres, 54, 60 



Magnetic force, laws of, 149 ff.; 

 moment, 244; permeability, 339; 

 poles, 153; units, definition of, 



243 



Magnetism, Ampfere's theory of, 

 229; discovery of, 153; earth's, 

 242 



Manganese, Scheele's work on, 142 



Mars, 17,43 



Mass, 85 



Mass and energy, relationship be- 

 tween, 373 ff. 



Mass, concept of, 77 



Mass, inertial and electrical, 372 



Mathematics, nature of, 220 f., 

 294 f . 



Matter, physics of, 25 



Maxwell's equations, 339, 364 f. 



Mecaniqiie Celeste (Laplace), 222 



Mechanics of heavens, 87 



Melting point, variation with pres- 

 sure of, 334 



Mendelism, 321 ff. 



Meridian, measurement of, 51 



Metre, 51 



Microscope, 74 



Molecular forces, 96 



Molecules, 178 



Molecules, forces between, 304 f. 



Moon, 10; motion of, 88 



Motion, Newton's laws of, 86 



Nebulae, spectrum of, 331 



Neptune, orbit of, 241 



Nervous stimuli, electrical nature 



of, 313 

 Neio Astronomy (Kepler), 44 

 Newton's rings, 206 

 Nitric acid, composition of, 147 

 Nitric oxide, discovery of, 145 

 Nitrogen chloride (Faraday and 



Davy), 250 

 Nitrogen, discovery of, 141 

 Nitrous oxide, 192; discovery of, 



14s 



Ohm's law, 236 f. 



Ophthalmoscope, 293 



Organic chemistry, beginnings of, 



3" 

 Origin of Species (Darwin\ 318 

 Oxygen, discovery of, 141 



