SUBJECT INDEX 



Absorption of radiant energy, 16 

 by cells, 15 



competing or screening absorp- 

 tion, 41, 42, 45 

 flattening effect of "thick sam- 

 ples," 45 

 of scattering sample measured in 



integrating sphere, 22, 23 

 "thin sample" role, 42, 43 

 Absorption spectra, see Spectra; 



Spectrum 

 Acclimation, 671 

 Adenohypophysis, 729, 730, 733, 



734 

 Adrenalectomy, 818, 819, 826- 



829 

 Adrenal factors, 803, 804, 812, 

 818-824, 826, 829, 830, 842, 

 864, 865 

 Adrenals, 801 

 Algae, 25, 26, 35 

 growth of, 37 



dependence on temperature and 

 light, 37 

 Amo-1 6 18, 365-370 

 Anaerobiosis 



efl'ect on flowering, 299 

 Antagonism 



between radiation effects, 116. 

 118 

 red and near infrared, 101, 

 103,107,118 

 Antiauxins 



influence on photoperiodic induc- 

 tion in long-day plants, 338 



influence on photoperiodic induc- 

 tion in short-day plants, 332, 

 334 

 Aphids 



"critical" photoperiod in, 596 



parthenogenetic and sexual repro- 

 duction in, 595 



photopcriodism in, 602 



reproductive types, 602 



sex determination in, 595-597 



wing production in, 602 

 Arthropods 



effect of continuous darkness on, 

 621 



effect of temperature on photo- 

 periodic responses of, 618 



response to continuous darkness, 

 614 

 Autonomous cycle 



in nyctinastic movement, 558 

 Auxin, 245, 357, 385, 388, 393, 

 394, 399,402, 403,405, 413- 

 415 



analyses in short-day plants, 335 



destruction of, 188, 189, 191 



effect on pea internode section 

 growth, 181, 186-195 



endogenous in photopcriodism, 

 226,231,237-240 



influence on photoperiodic induc- 

 tion in long-day plants, 337- 

 340 



influence on photoperiodic induc- 

 tion in short-day plants, 330- 

 336 



885 



