SUBJECT INDEX 



887 



Chipmunk 



activity rhythms of, 797 

 Chi or el I a 



absorption spectrum of, 20, 21, 

 32,33 

 Chlorophyll, 537 



colloidal, spectrum of, 17, 18 

 diurnal changes in, 538 

 fluorescence, 1 19 

 fluorescence spectrum in ceUs, 34, 

 35 

 Chlorophylls, 17 



absorption spectrum of, 16 

 active and inactive, 28 

 crystals, 18 



forms of in vivo, 32-34 

 Chlorophyll b, 33 



derivative spectra of in plants, 32 

 Chlorosis, 555 



photoperiodic, 455, 456 

 Chromoperiodism, 353, 357 

 Chrysanthemum (C. mori folium 

 Ramat) 

 flowering of, 279 



far-red repromotion of, 280 

 red inhibition of. 280 

 repeated reversibility of, 283 

 Citellus 



breeding season of, 801 

 light effect on, 801, 802 

 temperature effect on, 801 

 Clock, biological, 463, 510, 516, 

 518-521, 527, 575, 577, 578, 

 817,825,836,843,852 

 effect of gibberellin on, 465 

 effect of kinetin on, 465 

 in Gonyaulax, 567, 568 

 mechanism of, 466 

 period of, 464 

 phasing of, 441 , 442, 444 

 photophil phase of, 469, 498, 



500,501 

 precision of, 441, 443, 444 



resetting of in Gonyaulax, 580, 



581 ^ 

 ribonucleic acid in, 582 

 scotocycle, 468 



scotophil phase of, 498, 500-502 

 Cobaltous ion, 384, 386-391 

 Coefficient of variability, 556 

 Colchicine 



influence on diurnal periodicity, 

 519 

 Coleoptera 



photoperiodism in, 602 

 Coleoptile (see/4ve/i«) 

 Corn 



chlorophyll formation in, 27-29 

 Correlogram, 805, 810 

 Corticosterone, 822, 826, 827, 847- 



849, 864 

 Cortisone, 826, 827 

 Coumarin 



effect on lettuce seed germination, 

 308 

 Coupled osciUator, 494, 496, 498, 

 503 

 as model for daily rhythms, 491- 



493 

 in relation to photoperiodism, 



499, 500 

 in relation to thermoperiodism, 

 499, 500 

 Crossed gradients 



use of in photobiological studies, 

 37 



Dalapon, see 2, 2-Dichloropropionic 

 acid 



Darkness 

 continuous 



effect on Acronycta, 621 

 effect on Antheraea, 621 

 effect on arthropods, 621 

 effect on Diataraxia, 62 1 

 effect on Grapholitha, 62 1 



