INDEX
Archimedes, [104].
Atmospheric refraction, [45].
Barrow, Isaac, [126].
Bartholinus, Erasmus, [53], [54], [57], [60], [97], [99].
Boyle, Hon. Robert, [11].
Cassini, Jacques, [iii].
Caustic Curves, [123].
Crystals, see Iceland Crystal, Rock Crystal.
Crystals, configuration of, [95].
Descartes, Rénê, [3], [5], [7], [14], [22], [42], [43], [109], [113].
Double Refraction, discovery of, [54], [81], [93].
Elasticity, [12], [14].
Ether, the, or Ethereal matter, [11], [14], [16], [28].
Extraordinary refraction, [55], [56].
Fermat, principle of, [42].
Figures of transparent bodies, [105].
Hooke, Robert, [20].
Iceland Crystal, [2], [52] sqq.
Iceland Crystal, Cutting and Polishing of, [91], [92], [98].
Leibnitz, G.W., [vi].
Light, nature of, [3].
Light, velocity of, [4], [15].
Molecular texture of bodies, [27], [95].
Newton, Sir Isaac, [vi], [106].
Opacity, [34].
Ovals, Cartesian, [107], [113].
Pardies, Rev. Father, [20].
Rays, definition of, [38], [49].
Reflexion, [22].
Refraction, [28], [34].
Rock Crystal, [54], [57], [62], [95].
Römer, Olaf, [v], [7].
Roughness of surfaces, [27].
Sines, law of, [1], [35], [38], [43].
Spheres, elasticity of, [15].
Spheroidal waves in crystals, [63].
Spheroids, lemma about, [103].
Sound, speed of, [7], [10], [12].
Telescopes, lenses for, [62], [105].
Torricelli's experiment, [12], [30].
Transparency, explanation of, [28], [31], [32].
Waves, no regular succession of, [17].
Waves, principle of wave envelopes, [19], [24].
Waves, principle of elementary wave fronts, [19].
Waves, propagation of light as, [16], [63].