- Reduction, of syllogisms, 85;
- ad absurdum, 415;
- of observations, 552, 572.
- Reflection, total, 650.
- Refraction, atmospheric, 340, 356, 500;
- law of, 501;
- conical, 540;
- double, 585.
- Regnault, dilatation of mercury, 342;
- measurement of heat, 350;
- exact experiment, 397;
- on Boyle’s law, 468, 471;
- latent heat of steam, 487;
- graphical method, 494;
- specific heat of air, 557.
- Reid, on bifurcate classification, 697.
- Reign of law, 741, 759.
- Rejection of observations, 390.
- Relation, sign of, 17;
- logic of, 22;
- logical, 35;
- axiom of, 164.
- Repetition, method of, 287, 288.
- Representative hypotheses, 524.
- Reproduction, modes of, 730.
- Reservation of judgment, 592.
- Residual effects, 558;
- phenomena, 560, 569.
- Resisting medium, 310, 523, 570.
- Resonance, 453.
- Reusch, on substitution, 21.
- Reversal, method of, 354.
- Revolution, quantity of, 306.
- Robertson, Prof. Croom, 27, 101.
- Robison, electric curves, 446.
- Rock-salt, 609.
- Rœmer, divided circle, 355;
- velocity of light, 535.
- Roscoe, Prof., photometrical researches, 273;
- solubility of salts, 280;
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INDEX.
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