- Symbols, use of, 13, 31, 32;
- of quantity, 33.
- Synthesis, 122;
- of terms, 30.
- T
- Table-turning, 671.
- Tacit knowledge, 43.
- Tacquet on combinations, 179.
- Tait, P. G., 375;
- theory of comets, 571.
- Talbot on the spectrum, 429.
- Tartaglia on projectiles, 466.
- Tastes, classification of, 732.
- Tautologous propositions, 119.
- Teeth, use in classification, 710.
- Temperature, variations of, 453.
- Tension of aqueous vapour, 500.
- Terms, 24;
- abstract, 27;
- substantial, 28;
- collective, 29;
- synthesis of, 30;
- negative, 45.
- Terrot, Bishop, on probability, 212.
- Test experiments, 347, 433.
- Tetractys, 95.
- Thales, predicted eclipse, 537.
- Theory, results of, 534;
- facts known by, 547;
- quantitative, 551;
- of exchanges, 571;
- freedom of forming, 577;
- of evolution, 761.
- Thermometer, differential, 345;
- reading of, 390;
- change of zero, 390.
- Thermopile, 300.
- Thomas, arithmetical machine, 107.
- Thomson, Archbishop, 50, 61.
- Thomson, James, prediction by, 542;
- on gaseous state, 654.
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