- by disjunctive propositions, 76;
- indirect method of, 81;
- nature of, 118;
- principle of mathematical, 162;
- certainty of, 236.
- Infima species, 701, 702.
- Infiniteness of universe, 738.
- Inflection of light, 420.
- Instantiæ, citantes, evocantes, radii, curriculi, 270;
- monodicæ, irregulares, heteroclitæ, 608;
- clandestinæ, 610.
- Instruments of measurement, 284.
- Insufficient enumeration, 176.
- Integration, 123.
- Intellect, etymology of, 5.
- Intension of logical terms, 26, 48;
- of propositions, 47.
- Interchangeable system, 20.
- Interpolation, 495;
- in meteorology, 497.
- Inverse, process, 12;
- operation, 122, 689;
- problem of two classes, 134;
- problem of three classes, 137;
- problem of probability, 240, 251;
- rules of inverse method, 257;
- simple illustrations, 253;
- general solution, 255.
- Iodine, the substance X, 523.
- Iron, properties of, 528, 670.
- Is, ambiguity of verb, 16, 41.
- Isomorphism, 662.
- Ivory, 375.
- J
- James, Sir H., on density of earth, 567.
- Jenkin, Professor Fleming, 328.
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