900 



SUBJECT INDEX 



Rhythm, activity (Continued) 



temperature coefficient of mam- 

 malian, 798 

 cellular rhythmicity, 549 

 circadian, 813-816, 835, 837, 



838, 843, 858, 865 

 diurnal, 475, 484, 541, 546, 555, 

 567-570 

 in dinoflagellates, 567 

 as functional time-measuring 

 systems, 476 

 effect of blinding, 813-817, 832, 



840 

 endogenous, 546, 791-800 



mammals and other vertebrates, 

 791-800 

 entrainment of by light, 576 

 in Gonyaulax, 567-582 



effect of light on, 568-570, 



572, 574, 577-580 

 feedback in, 581 

 natural period of, 575 

 phase shift of, 577-581 

 010 of period, 580, 581 

 internal reproductive, 645 

 mammal activity, 791-800 



effect of temperature on, 797- 

 799 

 in man, 803, 804, 820, 839, 844, 

 853, 854, 856-858, 861, 862, 

 864, 865 

 persistent, 567, 569 

 ultraviolet, effect on rhythmicity, 



541,548,549 

 visible light, effect on rhythmicity, 

 546, 548-550 

 Ribonucleic acid (RNA), 825, 826, 

 847 

 in biological clocks, 582 

 relation to induction of flowering, 

 419 

 RNA, see Ribonucleic acid 



Sarracenia purpurea 



distribution of midge populations, 



619 

 isolation of midge populations, 

 619 

 Scattering 



attenuation of light by, 19 

 distortion of spectra by, 22 

 of light by cells, 22 

 of light by pigment particles, 2 1 

 wavelength selective, 21 

 Scotophil, 553 

 Scotophilic phase, 542, 543, 549 



interruption of, 548 

 Scotophil status, 525, 531, 534 

 Seed, see Germination 

 Semiquinones, 6, 7 

 Sexual activity 



autumnal, 739, 740 

 Shoots 



excision of axillary shoots, 393- 

 406 

 Short-day effect 



spectral dependence of, 104 

 Short-day plants, 245-247, 249, 

 250, 252, 376-378, 381 

 carbon dioxide metabolism of, 



289,293,298 

 influence of auxin on photoperi- 

 odic induction, 330-336 

 Short-day treatment 



effect on flowering, 395, 401 

 effect on leaf growth, 401 

 effect on stem growth, 401 

 Short-long day plant, 3 1 5-3 1 8 

 Solar compass, 527 

 Spectra; see also Spectrum 

 absorption, 16, 17, 20-22 

 broadening of, 17, 18 

 of Chlorella, 21 

 of chlorophyH fl, 16, 17 

 of Euglena, 1 6 



