INDEX OF SUBJECTS 



Night blindness, 49, 197, 209 



of fovea, 50, 83, 208 

 Null-point, 216 

 Nystagmus, 187 



Olive-green, 25, 36 



Opponent colours theory, 200, 251 



Optogram, 11, 13 



Pentachromic. 294 



Peripheral luminosity curve, 71, 173 

 Peripheral vision, 17, 50, 66, 123. 204, 208, 

 218, 283 



in dichromats, 173, 176, 179 

 Persistency curve, 62 

 Phenomenon, nicker, 93 



Purkinje, 57, 84, 96, 175, 177, 206, 210, 



257 



Philology, 145 

 Photerythrous, 168 

 Photochemical theory, 289, 2!) I 

 Photochromatic interval, 60, 80, 81, 120 

 Photometry, heterochromatic. 43, 96 

 Photopia, 17, 27, 203 

 Phototrophism, 130, 142 

 Pigmentation, lenticular, 8, 41, 181 



macular, 41, 169, 181, 183, 241, 259 

 Pigment epithelium, 11, 145, 197, 211, 



212 



Pigments. 6, 78 

 Porter's law, 96, 208 

 Preference method, 132, 137 

 Primitive races, colour blindness in. 147, 

 148, 150 



colour vision of, 131, 145 

 Protanopic vision, 159, 232, 287 

 Psychological process, 274 

 Psychologv, comparative, of colour vision, 



131," 211, 298 



Psychology of colour vision, 17 

 Psycho-physical methods. 19 



parallelism, 21, 274, 290 

 Pupil reactions, 139, 141, 206 

 Purkinje's phenomenon, 57, 84 96, 206, 

 210, 257 



in dichromats, 175, 177 



reversed, 97 

 Purple, 27 



visual, 12, 196, 205, 212, 220, 292 



Rayleigh mixture, 182, 242 

 Reactions, pupil, 139, 141, 206 

 Recurrent vision, 85 



Regional effects, 66, 95, 98, 117, 123, lV,x. 

 285 



in dichromats, 177 

 Reptiles, anatomy, 11, 15 



colour vision of, 142 

 Retina, anatomy of, 8 

 Retinitis pigrnentosa, 209, 211 

 Rhodopsin, 12 (see Visual purple) 

 Right and wrong answers, method of, 19 

 Rod -free area, 10, 203 

 Rods and cones, 9, 196, 203 



Santonin, 211 



"Satellite," 86 



Saturation, 29. 36, 39, 59, 229. 250 



Scoterythrous, 168 



Scotoma, 103 



central, 188, 267 

 Scotopia, 17, 49, 52, 203 



achromatic, 14, 53 



chromatic, 53 

 Sectors, rotating, 5,. 92 

 Sensation curves, 222 

 Sensation stimulator, 286 

 Sensibility area, 119 

 Shift of sensation curve, 243 

 Shortening of the spectrum, 168 

 Simple colours, 25, 27, 104, 220, 224, 251, 



276 



Simultaneous contrast, 17, 125, 219, 255, 

 264, 279 



induction (Hering,) 125, 127, 219, 255, 



279 



Spatial induction, 17, 125, 219, 255, 264 

 Specific brightness of colours, 256, 267 

 "Specific energies'' of the senses, law of the, 



18 



Specific threshold or liminal value, 19, <>0 

 Spectrophotometer, 5, 222 

 Spectrum, 1, 27, 49 



diffraction, 3 



dispersing, 3 



energy of, 28 



interference, 3 



prismatic, 3 



Spectrum, gauging the, 39, 164, 215 

 Standard deviation, 149 

 Stimuli, adequate and inadequate, 19 

 Stimulus receptor, 286 

 Structural changes due to light, 11 

 Successive contrast, 101, 219. 254, 279 



induction, 101, 219, 254, 279 

 Surface contrast, 127 

 Synapses, 274 



Talbot-Plateau law 92 



Temporal effects, 85, 208 



Temporal induction, 17, 49, 203, 255 



Tetrachromic, 294 



Theories, 193 



Theory, 193 



Bonders', 270 



duplicity, 198, 203 



Edridge-Green's, 291 



Hering's, 200, 251 



Ladd-Franklin's, 271 



McDougall's, 274 



G. E. Miiller's, 290 



opponent colours, 200, 25?. 



physical, 198 



Schenck's, 285 



three-components, 199, 213 



of two retinas, 197 



Wundt's, 289 



Young-Helmholtz, 199, 213 



of zones, 200 



