- gravity, 463;
- on ether, 514.
- Everett, Professor, unit of angle, 306;
- metric system, 328.
- Evolution, theory of, 761.
- Exact science, 456.
- Exceptions, 132, 644, 728;
- classification of, 645;
- imaginary, 647;
- apparent, 649;
- singular, 652;
- divergent, 655;
- accidental, 658;
- novel, 661;
- limiting, 663;
- real, 666;
- unclassed, 668.
- Excluded middle, law of, 6.
- Exclusive alternatives, 68.
- Exhaustive investigation, 418.
- Expansion, of bodies, 478;
- of liquids, 488.
- Experiment, 400, 416;
- in probability, 208;
- test or blind, 433;
- negative results of, 434;
- limits of, 437;
- collective, 445;
- simplification of, 422;
- failure in simplification, 424.
- Experimentalist, character of, 574, 592.
- Experimentum crucis, 518, 667.
- Explanation, 532.
- Extent of meaning, 26;
- of terms, 48.
- Extrapolation, 495.
- F
- Factorials, 179.
- Facts, importance of false, 414;
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