902 



SUBJECT INDEX 



Stem elongation {Continued) 

 influence of wavelength on, 106- 



108 

 inhibition of, 217-221 

 of lettuce internodes, 120, 122, 



123 

 mutual antagonism of growth reg- 

 ulators, 368-370 

 promotion of, 218-221 

 Suboesophageal ganglion, 592 

 Sunlight 



intensity of, 440, 445-447, 453 

 spectrum of, 440, 444 

 Synchronization, 811, 816, 817, 

 823, 832, 840, 843, 844, 860, 

 865-867 

 in cell development, 557 

 with solar cycle, 560 

 Synchronizer, 817, 833, 836-838, 

 844, 851, 854 



Temperature 



coefficient for clock, 464 

 coefficient of mammalian activity 



rhythms, 798 

 effect on algal growth and pig- 

 ment formation, 37 

 effect on breeding, 643 

 effect on Ci tell us, 801, 802 

 effect on flowering;, 249, 252, 414 

 effect on influence of day length 



on fish sex cycle, 653, 660, 662 

 effect on insects, 587, 588 



dependence of photoresponse 

 on, 587, 588 

 effect on mammal activity rhythms, 



797-799 

 effect on photoperiodic response 



of Antheraea, 618 



of arthropods, 618 



oiBombyx, 618 



of Diataraxia, 618 



of Grapholitha, 6 1 8 

 of Metatetranychus, 618 

 independence of Gonyaulax clock 



to, 574 

 influence on diurnal periodicity, 



512-516 

 in Metriocnemus knabi, 618 

 natural cycles of, 464 

 natural fluctuations in, 441 

 nictotemperature, 357 

 in photoperiodic testicular re- 

 sponse, 736, 737 

 rectal, 806-808, 815, 834, 839, 



842, 856, 863 

 relation to photoperiodism, 357 

 relation to reproduction, 625, 



627, 634-637 

 separation of effects of gibberellic 

 acid, kinetin, and light by 

 means of, 198-205 

 Testes, 718, 719, 723-735 



growth curve of, 720-722 

 Testicular development 



effect of photoperiod, 727-73 1 

 as function of light intensity, 723, 



724 

 as function of wavelength, 724 

 mechanism of photoperiodic ef- 

 fect, 727-731 

 Thermoperiodism, 477, 478, 499, 



503, 552, 558 

 Thermoreceptor, 562 

 Thermoregulation, 671, 672, 673, 



675 

 Thiobenzophenone, 4 

 Thyroid, 801 

 Time 



measurement of, 251 



temperature-independent, 475, 

 479 

 sense of, 507 

 Time memory, 527 

 Timing processes, 524, 532 



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