- Design, 762–763.
- Determinants, inference by, 50.
- Development, logical, 89, 97.
- Diagnosis, 708.
- Dichotomy, 703.
- Difference, 44;
- law of, 5;
- sign of, 17;
- representation of, 45;
- inference with, 52, 166;
- form of, 158.
- Differences of numbers, 185.
- Differential calculus, 477.
- Differential thermometer, 345.
- Diffraction of light, 420.
- Dimensions, theory of, 325.
- Dip-needle, observation of, 355.
- Direct deduction, 49.
- Direction of motion, 47.
- Discontinuity, 620.
- Discordance, of theory and experiment, 558;
- of theories, 587.
- Discoveries, accidental, 529;
- predicted, 536;
- scope for, 752.
- Discrimination, 24;
- power of, 4.
- Disjunctive, terms, 66;
- conjunction, 67;
- propositions, 66;
- syllogism, 77;
- argument, 106.
- Dissipation of energy, 310.
- Distance of statements, 144.
- Divergence from average, 188.
- Diversity, 156.
- Divine interference, 765.
- Dollond, achromatic lenses, 608.
- Donkin, Professor, 375;
- on probability, 199, 216;
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