- bifurcate, 694;
- an inverse and tentative operation, 689;
- diagnostic, 710;
- by indexes, 714;
- of books, 715;
- in biological sciences, 718;
- genealogical, 719;
- by types, 722;
- limits of, 730.
- Clifford, Professor, on types of compound statements, 143, 529;
- first and last catastrophe, 744;
- mathematical function, 768.
- Clocks, astronomical, 340, 353.
- Clouds, 447;
- cirrous, 411.
- Coincidences, 128;
- fortuitous, 261;
- measurement by, 292;
- method of, 291.
- Collective terms, 29, 39.
- Collocations of matter, 740.
- Colours, iridescent, 419;
- natural, 518;
- perception of, 437;
- of spectrum, 584.
- Combinations, 135, 142;
- doctrine of, 173;
- of letters of alphabet, 174;
- calculations of, 180;
- higher orders of, 194.
- Combinatorial analysis, 176.
- Comets, 449;
- number of, 408;
- hyperbolic, 407;
- classification of, 684;
- conflict with, 746–7;
- Halley’s comet, 537;
- Lexell’s comet, 651.
- Commutativeness, law of, 35, 72, 177.
- Comparative use of instruments, 299.
- Compass, variations of, 281.
- Complementary statements, 144.
- Compossible alternatives, 69.
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