SUBJECT INDEX 



753 



Illumination, 127 



continuous, 524-525 

 Image formation in pecten, 638 

 Incandescent tungsten lamp, 157-164 



application over plants, 161 



effect of voltage variation on, 160 



electrical .characteristics, 160 



as infrared source, 163 



internal reflector, 161 



life of, 158 ' 



projection, 162 



radiation properties, 157-158 



radiation properties of tungsten, 158 



spectral emission, 159 

 Induction phenomena, of fluorescence, 

 311, 314, 315 



of photosynthesis, 324, 331, 341 

 Infrared, 525-527 



near, absorption, fluorescence, and re- 

 flection spectra, 302, 303, 351, 

 370-388 

 Infrared visibility, 670 

 Inhibiting layer, 538 

 Inhibitors, naturally occurring, 528 

 Insects, compound eyes, 646-653, 656- 

 659 



ocelli, 645-646 



pollinating, 666 

 Integrating sphere, 347, 348 

 Intensity, absorption, 76, 84, 90, 91 



emission, 83, 84 



single-triplet, 82, 84 

 Intensity discrimination, 621, 669 

 Intensity formulas for porphyrins, 108- 



110 

 Internal conversion, of energy, 11 



types, 14-17 

 Inverse square law, 138 

 Iris tapetum, 649 

 Irradiance, 127 

 Irradiation, 127 

 Isopods, compound eyes, 655 

 Isotopes in photosynthesis research, 297, 

 315-323, 334 



Joseph's cells, 663 



K 



Kasha effect, 85 



Kuhn periodicity, 78, 82 



Labidocera, single ommatidium, 656 



Lactate, 323 



Lactuca, 350, 522-525, 527, 529, 534 



Lambert, definition, 137 

 Lambert cosine law, 139 

 Latninaria sp., 352, 353 

 Lamps, comparative radiation character- 

 istics, 182 

 comparative spectral ('haracteristics, 



181 

 incandescent tungsten, 157-164 

 standard, 244-250 -* 



black-body, 244-245 

 color temperature, 248 

 housing for, 245 

 incandescent, 245 

 luminous intensity, 247 

 radiant intensity, 245 

 spectrum, 249 

 {See also Illumination; Radiant-energy 

 sources) 

 Lantadenes, 714 

 Latency of photic response, 640-641, 661, 



664 

 LCAO method (linear combination of 

 atomic orbitals), 71, 87, 93, 115-117 

 correspondence with resonance method, 



71 

 intensity predictions, 76 

 Lead selenide photocell, 237 

 Lead sulfide photocell, 237 

 Lead telluride photocell, 237 

 Leander, hue discrimination, 666 

 Leaves, absorption and reflection spectra, 

 348-354 

 efficiency as light traps, 349 

 Lens, aberrations, 142 

 achromats, 142 

 aspherical, 142 

 astigmatism, 142 

 chromatic, 142 

 formulas, 140 

 spherical, 142 

 Leodice (Eunice), 634 

 Lepidurus, compound eyes, 656 

 Leptodora, dark adaptation, 664 



loss of eye pigment, 658 

 Leukophyll, 396, 413 

 Light, antagonistic, 526 

 blue, 525-527 



influence on decoated seeds, 533 

 catalytic action, 539 

 definition, 126 

 frequency, 262 

 indifferent, definition, 521 

 influence of, on oxidation-reduction, 

 540 

 on permeability, 542 

 infrared, 525-527 

 inhibiting, definition, 520 

 mechanical equivalent, 138 

 quality, 525-527 



