- Protoplasm, 524, 764.
- Prout’s law, 263, 464.
- Provisional units, 323.
- Proximate statements, 144.
- Pyramidal numbers, 185.
- Pythagoras, on duality, 95;
- on the number seven, 262, 624.
- Q
- Quadric variation, 474.
- Qualitative, reasoning, 48;
- propositions, 119.
- Quantification of predicate, 41.
- Quantitative, reasoning, 48;
- propositions, 119;
- questions, 278;
- induction, 483.
- Quantities, continuous, 274;
- incommensurable, 275.
- Quaternions, 160, 634.
- Quetelet, 188;
- experiment on probability, 208;
- on mean and average, 363;
- law of error, 378, 380;
- verification of law of error, 385.
- R
- Radian, 306.
- Radiant matter, 642.
- Radiation of heat, 430.
- Radiometer, 435.
- Rainbow, theory of, 526, 533.
- Rainfall, variation of, 430.
- Ramean tree, 703, 704.
- Ramsden’s balance, 304.
- Rankine, on specific heat of air, 557;
- reconcentration of energy, 751.
- Rational formulæ, 489.
- Rayleigh, Lord, on graphical method, 495.
- Reasoning, arithmetical, 167;
- numerically definite, 168;
- geometrical, 458.
- Recorde, Robert, 15.
Table of Contents
INDEX.
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