SUBJECT INDEX 



749 



Dermal photosensitivity, in Chromodoris, 

 6-11 

 in crustaceans, 642-643 

 in echinoderms, 659-662 

 in Eunice, 635 

 in hemichordates, 662 

 in insects, 643 

 in Onchidium, 641 

 in rotifers, 631 

 in slugs, 640 

 Desensibilization, definition, 521 

 induced, by darkness, 530 

 by gases, 531 

 Detailed balancing, 5 

 Detectors of radiant energj', 218 

 bolometer, 221-225 

 circuits for, 223 

 metal, 223 

 niobium nitride, 224 

 superconductor, 224 

 thermistor, 224 

 chemical, 219 

 effect of cooling on, 241 

 Golay, 228 

 human eye, 219 

 Johnson noise, formula for, 241 

 measuring instruments, 242 

 noise voltage, 240 

 Nyquist fornnda, 241 

 photoconductive cell, 236 



spectrum, 237 

 photoemission cell, 230-236 



spectrum, 232 

 photographic emulsion, 219 

 photomultiplier, 234-236 

 photovoltaic cell, 237-240 

 cosine error, 240 

 self-generating, 238 

 pneumatic, 227 



radiation chopping devices, 242 

 selective, 219 

 sensitivity limits, 240-243 

 signal-to-noise ratio, 240 

 thermal, 218, 220 



noise-equivalent power, 220 

 sensitivity, 220 

 time constant, 220 

 thermal noise, formula, 241 

 thermocouple, 225 

 thermopile, 225-227 

 circuits, 228 

 Deuterium, 316 

 Diabatic processes, 35 

 Diadema, photic responses, 661 

 Diapause control, 482 

 Diaphototropism, -163 

 Diastylis, compound eyes, 655 

 Diatomic molecide, potential function, 3 

 Diatoms, 305, 306, 308, 327, 328 



Differential filters, 526 

 Digitaria, 531, 536 

 Digitonin, 528 



p-Dimethylaminobenzaldehyde, 323 

 Dineutes, dark adaptation, 664 

 Dinophilus, eyespots, 632 

 Diphenylbutadiene spectrum, 72, 79 

 Diphosphopyridine nucleotide, 322 

 Diplopoda, ocelli, 645 

 Diplopods, fossil, compound e,yes, 646 

 Directing power, 102 

 Discrimination, intensity, 621, 669 

 Dispersion of sound, 25-27 



chemical affinity in, 25 



theory for diatomic molecules, 26 

 Disubstitution effect on spectral intensi- 

 ties, 103 

 Divergence of ommatidia, 651 

 Divided compound eyes, 652, 657 

 Dixippus, 653, 667-669 

 Dominatcr elements, retinal, 603-605 

 Dormancy, deep, 522 



definition, 520 

 Double bonds, essential, 87 



twist of, 86, 87 

 Drone fly (Erisfalis), 664 

 Dropping-mercurv electrode, 206, 280, 



281 

 Drosera, 532 

 Drosophila, intensity discrimination, 650 



mutant reactions, 659 



Purkinje shift, 650 



role of ocelli, 646 



visual acuity, 669 

 Drving, influence of, on photosensitivity, 



531 

 Duplicity theory of arthropod compound 



eye, 652 

 Dytiscus, flicker detection, 668 

 Dytiscus larva, ocellus, 634 



E 



Echinaster, photosensitivity, 659 



Echinodermata, photosensitivity, 659 



Echinoidea, photosensitivity, 660 



Eczema, facial, 707, 713, 714 



Effectiveness spectra {see Spectra, action) 



Einstein, definition of, 133 



Einstein law of photochemical equiv- 

 alence, 133-134, 261 



Eisenia, photosensitivity, 635 



Electrical stimulation, phvsiological 

 effects, 610-611 

 visual effects, 610, 613-614 



Electrodes, recording, 582 



Electromagnetic spectrum, 129-130 



Electrometer, 243 



Electron densities, 77, 115-117 



