- Illicit process, of major term, 65, 103;
- of minor term, 65.
- Immediate inference, 50, 61.
- Imperfect induction, 146, 149.
- Inclusion, relation of, 40.
- Incommensurable quantities, 275.
- Incompossible events, 205.
- Independence of small effects, 475.
- Independent events, 204.
- Indestructibility of matter, 465.
- Indexes, classification by, 714;
- formation of, 717.
- India-rubber, properties of, 545.
- Indirect method of deduction, 49, 81;
- illustrations of, 98;
- fallacies analysed by, 102;
- the test of equivalence, 115.
- Induction, 11, 121;
- symbolic statement of, 131;
- perfect, 146;
- imperfect, 149;
- philosophy of, 218;
- grounds of, 228;
- illustrations of, 229;
- quantitative, 483;
- problem of two classes, 134;
- problem of three classes, 137.
- Inductive truths, classes of, 219.
- Inequalities, reasoning by, 47, 163, 165–166.
- Inference, 9;
- general formula of, 17;
- immediate, 50;
- with two simple identities, 51;
- from simple and partial identity, 53;
- with partial identities, 55;
- by sum of predicates, 61;
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