- moon’s influence on clouds, 410;
- comets, 411;
- spectrum analysis, 429;
- collective instances, 447;
- principle of forced vibrations, 451, 663;
- meteorological variations, 489;
- double stars, 499, 685;
- direct action, 502;
- use of theory, 508;
- ether, 515;
- experimentum crucis, 519;
- interference of light, 539;
- interference of sound, 540;
- density of earth, 567;
- residual phenomena, 569;
- helicoidal dissymmetry, 630;
- fluorescence, 664.
- Hindenburg, on combinatorial analysis, 176.
- Hipparchus, used method of repetition, 289;
- longitudes of stars, 294.
- Hippocrates, area of lunule, 480.
- History, science of, 760.
- Hobbes, Thomas, definition of cause, 224;
- definition of time, 307;
- on hypothesis, 510.
- Hofmann, unit called crith, 321;
- on prediction, 544;
- on anomalies, 670.
- Homogeneity, law of, 159, 327.
- Hooke, on gravitation, 436, 581;
- philosophical method, 507;
- on strange things, 671.
- Hopkinson, John, 194;
- method of interpolation, 497.
- Horrocks, use of mean, 358;
- use of hypothesis, 507.
- Hume on perception, 34.
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