- constant flame, 441;
- absorption of gases, 499;
- vanadium, 528;
- atomic weight of vanadium, 392, 649.
- Rousseau on geometry, 233.
- Rules, of inference, 9, 17;
- indirect method of inference, 89;
- for calculation of combinations, 180;
- of probabilities, 203;
- of inverse method, 257;
- for elimination of error, 353.
- Rumford, Count, experiments on heat, 343, 350, 467.
- Ruminants, Cuvier on, 683.
- Russell, Scott, on sound, 541.
- S
- Sample, use of, 9.
- Sandeman, on perigon, 306;
- approximate arithmetic, 481.
- Saturn, motions of satellites, 293;
- rings, 293.
- Schehallien, attraction of, 369, 566.
- Schottus, on combinations, 179.
- Schwabe, on sun-spots, 452.
- Science, nature of, 1, 673.
- Selenium, 663, 670.
- Self-contradiction, 32.
- Senior’s definition of wealth, 75.
- Senses, fallacious indications of, 276.
- Seven, coincidences of number, 262;
- fallacies of, 624.
- Sextus, fatality of name, 264.
- Sieve of Eratosthenes, 82, 123, 139.
- Similars, substitution of, 17.
- Simple identity, 37, 111;
- inference of, 58;
- contrapositive, 86;
- induction of, 127.
- Simple statement, 143.
- Simplicity, law of, 33, 58, 72.
- Simpson, discovery of property of chloroform, 531.
- Simultaneity of knowledge, 34.
- Singular names, 27;
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