XXXII

Aberration 49

Absorption of energy 46

Acceleration 64, 67, 70

Action at a distance 48

Addition of velocities 16, 38

Adjacent points 89

Aether 52 drift@-drift#drift 52, 53

Arbitrary substitutions 98

Astronomy 7, 102

Astronomical day 11

Axioms 2, 123 truth of 2

Bachem 131

Basis of theory 44

Being@"Being"#Being 66, 108

beta-rays@$\beta$-rays#rays 50

Biology 124

Cartesian system of co-ordinates 7, 84, 122

Cathode rays 50

Celestial mechanics 105

Centrifugal force 80, 130

Chest 66

Conception of mass 45 position 6

Conservation of energy 45, 101 impulse 101 mass 45, 47

Continuity 95

Continuum 55, 83 two-dimensional 94 three-dimensional 57 four-dimensional 89, 91, 92, 94, 122 space-time 78, 91-96 Euclidean 84, 86, 88, 92 non-Euclidean 86, 90

Coordinate@Co-ordinate#Co-ordinate differences 92 differentials 92 planes 32