- Empirical, knowledge, 505, 525–526;
- measurement, 552.
- Encke, on mean, 386, 389;
- his comet, 570, 605;
- on resisting medium, 523;
- solar parallax, 562.
- Energy, unit of, 322;
- conservation of, 465;
- reconcentration of, 751.
- English language, words in, 175.
- Eözoon canadense, 412, 668.
- Equality, sign of, 14;
- axiom, 163;
- four meanings of, 479.
- Equations, 46, 53, 160;
- solution of, 123.
- Equilibrium, unstable, 276, 654.
- Equisetaceæ, 721.
- Equivalence of propositions, 115, 120, 132;
- remarkable case of, 529, 657.
- Eratosthenes, sieve of, 82, 123, 139;
- measurement of degree, 293.
- Error, function, 330, 376, 381;
- elimination of, 339, 353;
- personal, 347;
- law of, 374;
- origin of law, 383;
- verification of law, 383;
- probable, 386;
- mean, 387;
- constant, 396;
- variation of small errors, 479.
- Ether, luminiferous, 512, 514, 605.
- Euclid, axioms, 51, 163;
- indirect proof, 84;
- 10th book, 117th proposition, 275;
- on analogy, 631.
- Euler, on certainty of inference, 238;
- corpuscular theory, 435;
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