- gravity, 604;
- principle of continuity, 617.
- Gallon, definition of, 318.
- Galton, Francis, divergence from mean, 188;
- works by, 188, 655;
- on hereditary genius, 385, 655.
- Galvanometer, 351.
- Ganières, de, 182.
- Gases, 613;
- properties of, 601, 602;
- perfect, 470;
- liquefiable, 665.
- Gauss, pendulum experiments, 316;
- law of error, 375–6;
- detection of error, 396;
- on gravity, 463.
- Gay Lussac, on boiling point, 659;
- law of, 669.
- Genealogical classification, 680, 719.
- General, terms, 29;
- truths, 647;
- notions, 673.
- Generalisation, 2, 594, 704;
- mathematical, 168;
- two meanings of, 597;
- value of, 599;
- hasty, 623.
- Genius, nature of, 575.
- Genus, 433, 698;
- generalissimum, 701;
- natural, 724.
- Geology, 667;
- records in, 408;
- slowness of changes, 438;
- exceptions in, 660.
- Geometric mean, 361.
- Geometric reasoning, 458;
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