- Arcual unit, 306, 330.
- Argyll, Duke of, 741.
- Aristarchus on sun’s and moon’s distances, 294.
- Aristotelian doctrines, 666.
- Aristotle, dictum, 21;
- singular terms, 39;
- overlooked simple identities, 40;
- order of premises, 114;
- logical error, 117;
- definition of time, 307;
- on science, 595;
- on white swans, 666.
- Arithmetic, reasoning in, 167;
- of approximate quantities, 481.
- Arithmetical triangle, 93, 143, 182, 202, 378, 383;
- diagram of, 184;
- connection with Logical Alphabet, 189;
- in probability, 208.
- Asteroids, discovery of, 412, 748.
- Astronomy, physical, 459.
- Atmospheric tides, 553.
- Atomic theory, 662.
- Atomic weights, 563.
- Atoms, size of, 195;
- impossibility of observing, 406.
- Augustin on time, 307.
- Average, 359, 360;
- divergence from, 188;
- etymology of, 363.
- Axes of crystals, 686.
- Axioms of algebra, 164.
- B
- Babbage, Charles, calculating machine, 107, 231, 743;
- lighthouse signals, 194;
- natural constants, 329;
- Mosaic history, 412;
- universal and general truths, 646;
- change of law, 230;
- persistence of effects, 757.
- Bacon, Francis Lord, Novum Organum, 107;
- on induction, 121;
- biliteral cipher, 193;
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