SUBJECT INDEX 



761 



Quantum energy, table of wave-length 



values, 133 

 Quantum requirement, 134, 263, 284-287 

 Quantum yield, 134, 262 



of photosjmthesis, 330, 331 

 Quenching, in anthracene, 46 



diffusion-limited, 38 



by electric fields, 14 



and electrical conductivity, 46 



elementary theory, 37 



by ions, 35 



of luminescence, 85, 91 



by magnetic fields, 14 



by paramagnetic ions, 14 

 Quinone, 95 



as Hill reagent, 296, 321, 323, 324, 328 



R 



Radiance, 127, 152 

 Radiant emittance, 127 

 Radiant energy, absorption, 144, 145 

 conversion factors, 131 

 definition, 126 

 frequency, 130-131 

 measurement, 242 

 nomenclature, 126-129 

 propagation, 138-143 

 reflection, 147 

 sources, 148 



alkali-metal arcs, 177 

 carbon arc, 167 



comparative radiation character- 

 istics, 182 

 exploded wires, 185 

 fluorescent lamp, 178 

 gaseous discharge, 164 

 incandescent tungsten lamp, 157 

 infrared, 163 

 globar, 163 



spectral-energy distribution, 163 

 miscellaneous discharge lamps, 178 

 photoflash lamp, 184 

 sparks, 185 



stroboscopic discharges, 185 

 sun, 152 

 spectral units, 130-131 

 standards, 243 

 transmission, 144 

 units, 128 



wave length, 130-131 

 wave number, 131 

 Radiant intensity, 127, 135 

 Radiation, black-body, 5, 52 



definition, 127 

 Radiation hypothesis of activation, 5 

 Radiation temperature, 151 

 Radiationless transitions, 83-85 



Radiator, 127 



black-body, 148-150, 182, 244-245 



complete, 148 



incomplete, 151 



perfect, 148 



Planckian, 148 



selective, 150 



thermal, 148 

 Radiometric units, 136 

 Radiometry, 127, 242-252 

 Ranunculus sceleratus, 522, 527 

 Ranzania, ocellus, 634 

 Rape scald, 709, 715 

 Rai/mondea pyrenaica, 522 

 Receptive field, retinal, 599-601 

 Reciprocity in photoperiodism, 493-495 

 Red algae, 306, 308-310, 356-370 

 Redox potential and photosynthesis, 299, 



321, 324-328, 334, 341 



Redox systems and photosynthesis, 316, 



322, 325 



" Reducing-power " generation in light, 

 315-319, 321, 323, 326, 327, 329 331, 

 334 

 Reflectance, 147 

 diffuse, 147 

 specular, 147 

 Reflecting materials, 191 

 Reflection, 147 

 Fresnel's law, 139 

 spectral, 191 



of black dyes, 193 

 of carbon black, 193 

 of metals, 191, 193 

 of pigments, 193 

 by white pigments, 139, 191, 193 

 Reflection spectra {see Spectra) 

 Resolving power, 658, 669 

 Resonance condition, in collisional energy 

 exchange, 29 

 in electronic processes, 39, 41m. 

 in fluorescence quenching, 47 

 Resonance energy, 14 

 Resonance method, correspondence with 



LCAO method, 71 

 Respiration, 282, 283, 286, 288, 535 

 in blue light, 535 

 correction for, 274 

 following illumination, 286 

 influence of photosynthesis, 320, 340 

 rate, 274, 276 

 of seed coats, 535 

 Respiration quotient, 535 

 Response, base, 465, 468, 473 



tip, 465, 473 

 Resting potential, retinal, 584 

 Retinal action potential (electroretino- 



gram), 584-594 

 Retinal movement in spider ocelli, 644 



