- Coulomb, 272.
- Couple, mechanical, 653.
- Creation, problem of, 740.
- Crookes’ radiometer, 435.
- Cross divisions, 144.
- Crystallography, 648, 654, 658, 678, 754;
- systems of, 133;
- classification in, 685.
- Crystals, 602;
- Dana’s classification of, 711;
- pseudomorphic, 658.
- Curves, use of, 392, 491, 496;
- of various degrees, 473.
- Cuvier, on experiment, 423;
- on inferences, 682.
- Cyanite, 609.
- Cycloid, 633.
- Cycloidal pendulum, 461.
- Cypher, 124.
- D
- D’Alembert, blunders in probability, 213, 214;
- on gravity, 463.
- Dalton, laws of, 464, 471;
- atomic theory, 662.
- Darapti, 59.
- Darii, 56.
- Darwin, Charles, his works, 131;
- negative results of observation, 413;
- arguments against his theory, 437;
- cultivated plants, 531;
- his influence, 575;
- classification, 718;
- constancy of character in classification, 720–1;
- on definition, 726;
- restoration of limbs, 730;
- tendency of his theory, 762, 764.
- Davy, Sir H., on new instruments, 270;
- nature of heat, 343, 417;
- detection of salt in electrolysis, 428.
- Day, sidereal, 310;
- length of, 289.
- Decandolle, on classification, 696.
- Decyphering, 124.
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