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Aberration, 59

Absorption of energy, 54

Acceleration, 76, 78, 83

Action at a distance, 57

Addition of velocities, 19, 46

Adjacent points, 105

Aether, 62

-drift, 62, 63

Arbitrary substitutions, 116

Astronomy, 8, 121

Astronomical day, 12

Axioms, 2, 149

truth of, 2

Bachem, 158

Basis of theory, 52

“Being,” 78, 128

$$\beta$$-rays, 59

Biology, 149

Cartesian system of co-ordinates, 7, 100, 147

Cathode rays, 59

Celestial mechanics, 125

Centrifugal force, 94, 156

Chest, 78

Classical mechanics, 9, 13, 16, 20, 36, 52, 84, 121, 123, 150

truth of, 15

Clocks, 11, 28, 95, 96, 112, 114, 117–120, 121, 135, 155

rate of, 156

Conception of mass, 54

position, 6

Conservation of energy, 54, 121

impulse, 121

mass, 54, 56

Continuity, 113

Continuum, 65, 98

Continuum, two-dimensional, 112

three-dimensional, 67

four-dimensional, 106, 108, 109, 112, 147

space-time, 93, 108-114

Euclidean, 99, 101, 104, 110

non-Euclidean, 102, 107

Co-ordinate differences, 109

differentials, 109

planes, 38

Cottingham, 154

Counter-point, 133

Co-variant, 51

Crommelin, 154

Curvature of light-rays, 124, 152

space, 153

Curvilinear motion, 88

Cyanogen bands, 158

Darwinian theory, 149

Davidson, 154

Deductive thought, 148

Derivation of laws, 52