SUBJECT INDEX 



759 



Phycoerythrin, 308, 309, 331 



(See also Phycobiliiis) 

 Phycomyces, 475 



Phyllium, visual identification by, 670 

 Phyllochlorin, 353, 398 

 Phyllodoce, ocellus, 634 

 Phylloerythrin in photosensitivity dis- 

 eases, 701, 703, 705, 708-715 

 Phyllosoma, single ommatidium, 656 

 Phy sails franchetti, 521 

 TT-Electrons, 72, 73, 89, 90 

 Pico- (multiplying prefix), 136 

 Pigment migration in eye, of arthropods, 

 648, 668-669 

 of caterpillar, 657 

 of cephalopods, 668 

 of Planorbis, 641, 668 

 of Plusia, 670 



spectral characteristics, 670 

 Pigment-protein complexes, 303, 305, 



331, 332 

 Pigments, 343-388 



energy transfer between (see Energy 



transfer) 

 other than chlorophyll, 281 

 photosynthetic, absorption spectra, 

 302, 303, 305, 307, 343-388 

 (See also Spectra) 

 visual, 623 

 Pilobolus, 475 

 Pinguicula, 532 



Pinhole-camera eye of Nautilus, 639, 641 

 Pisum, 528 



Planaria, photosensitivity, 629-630, 665 

 Planck's constant, 131-132, 262 

 Planck's radiation formula, 131-132, 150 

 Planorbis, pigment migration in eye, 641 

 Plantago, 528 

 Platinum electrode, 285 

 Platyhelminthes, photosensitivity, 629 

 Plusia, eye pigment migration, 670 

 sensitivity of, to infrared, 670 

 to ultraviolet, 665 

 Poa, 528, 536 

 nemoralis, 523 



pratensis, 522, 525, 532, 534 

 Polarization, of eyeball, 611 



of individual retinal units, 611-613 

 of spectroscopic transitions, 76, 91, 94, 

 95, 103, 105 

 Polarization plane, detection, 623, 654 

 Pollenia, flicker detection, 668 

 Pollinating insects, study of, 666 

 Polychaeta, photosensitivity, 632 

 Polyene spectra, 72, 76 



predictions, 74, 76 

 Polygordiiis, photoreceptors, 635 

 Polymethine dye spectra, 73, 75 

 Polyphenyls, 94 



Polysiphonia sp., 357, 358 

 Polystomum, eyespots, 630 

 Polythienyls, 95 



Pontella, single ommatidium, 656 

 Pontia, single ommatidium, 656 

 Popillia, latency of photic response, 664 

 Porcellio, compound eyes, 655 

 Porphin, 95, 96, 99, 100 



assignment of visible bands, 101, 106 

 dihydrochloride, 101 

 effect of substitutions on spectra, 102, 

 108-111 



location of central hydrogens, 100, 103, 

 104, 106 



salts, 101 



symmetry, 100, 101 

 Porphyra, 308, 309 



niadum, 362, 364, 366 

 Porphyridium cruentum, 357, 358, 365, 



366, 368, 369 

 Porphyrins, 96, 105 ff., 110, 111 



bands, Soret, 96, 100 



charge distribution, 115-117 



intensity formulas, 108 111 



metal complexes, 85, 101, 108 



in photosensitivity, 710, 716 



spectra, predicted and observed, 110- 

 111 



spectral types, 102, 111 



theoretical photochemistry of, 260-263 

 Potamides, ocelli, 638 

 Potamilla, compound eyespots, 632 

 Potassium nitrate, 527, 637 

 Potential, resting, 584 

 Potential energy, barrier, 39 



calculation for triatomic molecule, 9 

 Potential-energy surfaces, 2, 5-12 



for chemiluminescence, 54 



construction by semiempirical method, 8 



crossing of, 13-15 



crossing points for electronic processes, 

 39 



for fluorescence, 11 



gateways on (see Gateways) 



for N2O, 6-7 



for phosphorescence, 12 



for photosensitization and quenching, 

 39 



for rotational processes, 24 



for unstable systems, 10 

 Predissociation, 16, 88 

 Predissociation spectra, 36 

 Presoaking, influence on photosensitivity, 



531 

 Pressure broadening of spectral lines, 51 

 Primary ocelli of spiders, 644 

 Primula obconica, 522 

 Prisms, 202-204 



compared to gratings, 210 



