Six Lectures On Light

A

Absorption, principles of, 199

Airy, Sir George, severity and conclusiveness of his proofs, 209

Alhazen, his inquiry respecting light, 14, 207

Analyzer, polarizer and, 127
---- recompounding of the two systems of waves by the analyzer, 129

Ångström, his paper on spectrum analysis, 202

Arago, François, and Dr. Young, 50
---- his discoveries respecting light, 208

Atomic polarity, 93-96

B

Bacon, Roger, his inquiry respecting light, 14, 207

Bartholinus, Erasmus, on Iceland spar, 112

Bérard on polarization of heat, 180

Blackness, meaning of, 32

Boyle, Robert, his observations on colors, 65, 66
---- his remarks on fluorescence, 163, 164

Bradley, James, discovers the aberration of light, 21, 22

Brewster, Sir David, his chief objection to the undulatory theory of light, 47

Brewster, Sir David, his discovery in biaxal crystals, 209

Brougham, Mr. (afterwards Lord), ridicules Dr. T. Young's speculations, 50, 51

C

Cæsium, discovery of, 193

Calorescence, 174

Clouds, actinic, 152-154
---- polarization of, 155

Colors of thin plates, 64
---- Boyle's observations on, 65, 66
---- Hooke on the colors of thin plates, 67
---- of striated surfaces, 89, 90

Comet of 1680, Newton's estimate of the temperature of, 168

Crookes, Mr., his discovery of thallium, 193

Crystals, action of, upon light, 98
---- built by polar force, 98
---- illustrations of crystallization, 99
---- architecture of, considered as an introduction to their action upon light, 98
---- bearings of crystallization upon optical phenomena, 106

Crystals, rings surrounding the axes of, uniaxal and biaxal, 145

Cuvier on ardor for knowledge, 220

D

De Tocqueville, writings of, 215, 222, 223