- Compound statements, 144;
- events, 204.
- Compounds, chemical, 192.
- Comte, Auguste, on probability, 200, 214;
- on prevision, 536;
- his positive philosophy, 752, 760, 768.
- Concrete number, 159.
- Conditions, of logical symbols, 32;
- removal of usual, 426;
- interference of unsuspected, 428;
- maintenance of similar, 443;
- approximation to natural, 465.
- Condorcet, 2;
- his problem, 253.
- Confusion of elements, 237.
- Conical refraction, 653.
- Conjunction of planets, 293, 657.
- Consequent, definition of, 225.
- Conservation of energy, 738.
- Constant numbers of nature, 328;
- mathematical, 330;
- physical, 331;
- astronomical, 332;
- terrestrial, 333;
- organic, 333;
- social, 334.
- Continuity, law of, 615, 729;
- sense of, 493;
- detection of, 610;
- failure of, 619.
- Continuous quantity, 274, 485.
- Contradiction, law of, 31, 74.
- Contrapositive, proposition, 84, 136;
- conversion, 83.
- Conversion of propositions, 46, 118.
- Copernican theory, 522, 625, 638, 647.
- Copula, 16.
- Cornu, velocity of light, 561.
- Corpuscular theory, 520, 538, 667.
- Correction, method of, 346.
- Correlation, 678, 681.
- Cotes, Roger, use of mean, 359;
- method of least squares, 377.
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