- H
- Habit, formation of, 618.
- Halley, trade-winds, 534.
- Halley’s comet, 537, 570.
- Hamilton, Sir William, disjunctive propositions, 69;
- inference, 118;
- free-will, 223.
- Hamilton, Sir W. Rowan, on conical refraction, 540;
- quaternions, 634.
- Harley, Rev. Robert, on Boole’s logic, 23, 155.
- Harris, standards of length, 312.
- Hartley, on logic, 7.
- Hatchett, on alloys, 191.
- Haughton, Professor, on tides, 450;
- muscular exertion, 490.
- Haüy, on crystallography, 529.
- Hayward, R. B., 142.
- Heat, unit of, 324;
- measurement of, 349;
- experiments on, 444;
- mechanical equivalent of, 568.
- Heavy glass, 588, 609.
- Helmholtz, on microscopy, 406;
- undulations, 414;
- sound, 476.
- Hemihedral crystals, 649.
- Herschel, Sir John, on rotation of plane of polarisation of light, 129, 630;
- quartz crystals, 246;
- numerical precision, 273;
- photometry, 273;
- light of stars, 302;
- actinometer, 337;
- mean and average, 363;
- eclipses of Jupiter’s satellites, 372;
- law of error, 377;
- error in observations, 392;
- on observation, 400;
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