SUBJECT INDEX 



901 



Spectra (Continued) 

 action, 15, 22, 35 



comparison with absorption 



spectra, 15, 22 

 distortion of, 15, 22 

 for fluorescence excitation, 35 

 identification of pigment by, 15 

 fluorescence, 34, 35 

 distortion of, 34, 35 

 identification of pigment by, 

 34, 35 

 reflection, 23 



measurement with opal glass, 

 23 

 Spectral regions 

 blue 



inhibitory elTect on germina- 

 tion, 74-79 

 photoreversal of red effects by, 

 77,78 

 narrow, 111-127 



morphogenetic effects in 



Avena, 126 

 morphogenetic effects in Hyo- 

 scyamus, 113-119 

 Spectrophotometry 

 of cell suspensions, 24 

 derivative, 31-33 

 difference, 33, 34 

 fluorescence, 34, 35 

 of living cells, 24, 32 

 Spectrum 



absorption, 16 



of Euglena, 16 

 action 



of chlorophyll formation, 26- 



29 

 Glycine max var. Biloxi, 276 

 Hordeum vidgare L., 276 

 Hyoscyamus niger L., 276 

 of photomorphogenic induc- 

 tion, 449 



of photomorphogenic reversal, 



449 

 of photosynthesis, 25, 26 

 of phototaxis, 29, 30 

 resetting Gonydulax clock, 



580 

 Xanthium pensylvanicum, 276 

 emission, 567 



of Gonyaulax luminescence, 

 567 

 Spermatogenesis 



of fish, 653, 656, 659, 663 

 effect of day length on, 653, 



656, 663 

 effect of day length-tempera- 

 ture combinations on, 

 656, 659 

 effect of temperature on, 656, 



659 

 normal completion in relation 

 to breeding season, 653, 

 656, 659, 663 

 Sphere 



integrating, 22, 23 

 Spore discharge 



diurnal periodicity in, 508, 519 

 Stem appearance 



number of days to in Hyoscya- 

 mus, 115 

 Stem elongation, 365-367, 373, 

 376, 378, 379; see also Inter- 

 node 

 effect of gibberellic acid, 355 

 effect of light, 355 

 effect of photoperiodism, 355 

 m Hyoscyamus, 113-119 



in blue and near infrared, 1 1 3- 



115 

 suppression in blue by red ad- 

 dition, 116 

 suppression in green and red, 

 113-115 



