- terms, 129.
- Siren, 10, 298, 421.
- Slate, the logical, 95.
- Smeaton’s experiments, on water-wheels, 347;
- windmills, 401, 441.
- Smee, Alfred, logical machines, 107.
- Smell, delicacy of, 437.
- Smithsonian Institution, 329.
- Smyth, Prof. Piazzi, 452.
- Socrates, on the sun, 611.
- Solids, 602.
- Solubility of salts, 279.
- Some, the adjective, 41, 56.
- Sorites, 60.
- Sound, observations on, 356;
- undulations, 405, 421;
- velocity of, 571;
- classification of sounds, 732.
- Space, relations of, 220.
- Species, 698;
- infima, 701;
- natural, 724.
- Specific gravities, 301;
- heat of air, 557.
- Spence, on boiling point, 546.
- Spencer, Herbert, nature of logic, 4, 7;
- sign of equality, 15;
- rhythmical motion, 448;
- abstraction, 705;
- philosophy of, 718, 761, 762.
- Spectroscope, 437.
- Spectrum, 583.
- Spiritualism, 671.
- Spontaneous generation, 432.
- Standards of measurement, 305;
- the bar, 312;
- terrestrial, 314;
- pendulum, 315;
- provisional, 318;
- natural system, 319.
- Stars, discs of, 277;
Table of Contents
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