- Fluorescence, 664.
- Fontenelle on the senses, 405.
- Forbes, J. D., 248.
- Force, unit of, 322, 326;
- emanating, 464;
- representation of, 633.
- Formulæ, empirical, 487;
- rational, 489.
- Fortia, Traité des Progressions, 183.
- Fortuitous coincidences, 261.
- Fossils, 661.
- Foster, G. C., on classification, 691.
- Foucault, rotating mirror, 299;
- pendulum, 342, 431, 522;
- on velocity of light, 441, 521, 561.
- Fourier, Joseph, theory of dimensions, 325;
- theory of heat, 469, 744.
- Fowler, Thomas, on method of difference, 439;
- reasoning from case to case, 227.
- Frankland, Professor Edward, on spectrum of gases, 606.
- Franklin’s experiments on heat, 424.
- Fraunhofer, dark lines of spectrum, 429.
- Freezing-point, 546.
- Freezing mixtures, 546.
- Fresnel, inflexion of light, 420;
- corpuscular theory, 521;
- on use of hypothesis, 538;
- double refraction, 539.
- Friction, 417;
- determination of, 347.
- Function, definitions of, 489.
- Functions, discovery of, 496.
- G
- Galileo, 626;
- on cycloid, 232, 235;
- differential method of observation, 344;
- projectiles, 447, 466;
- use of telescope, 522;
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