SUBJECT INDEX 



893 



Insects (Continued) 



form determination in, 594 

 geographical strains of, 588, 589 

 hormones in, 592 

 inheritance of photoperiodism in, 



588 

 Hght ''breaks" in, 590 

 light intensity threshold for, 591 

 photoreceptors in, 591 

 role of dark period in, 590 

 spectral sensitivity of, 591 

 Intensity 



oflight, 572, 574, 575 

 effects upon Gonycndax 



rhythm, 572, 574, 575 

 Internode 



elongation in lettuce, 120, 122, 



123 

 growth of pea sections, 181-187, 

 189, 190, 192-195 

 effect of gibberellic acid, 181, 

 184, 185, 189, 190, 192- 

 195 

 effect of indoleacetic acid, 181, 



186, 187, 189-195 

 effect of initial length and dis- 

 tance from the apex, 182 

 effect of red and far-red radi- 

 ation, 181, 183, 184, 194 

 "endogenous growth," 183, 

 184, 187, 190 

 Interrupted night 



vs. extended day, 401 

 Irradiation 



high intensity, 111-127 



of tomato in wide spectral regions, 



126 

 spectral regions, 119, 121 

 effect on leaf shape in lettuce, 

 119-123 

 Irradiation, supplementary 



spectral dependence of effects, 

 105 



Kinetin ( 6-f urf urylaminopurine ) , 

 357 

 effect on germination of lettuce 



seed, 198-205 

 effect on internode section growth, 

 187, 192-194 

 compared with effects of red 

 light, 187, 192-194 

 effect on photomorphogenesis, 

 465 

 Kinin, see Kinetin 



Larva 

 phantom 



diapause in, 601 



photoperiodism in, 601 

 Leaf, 405, 406 



effect of defoliation on shape, 120, 



121 

 effect of light intensity on, 119, 



121-123^' 

 effect of night temperature on, 1 19 

 effect of nitrogen supply on, 1 1 9 

 effect of spectral region on, 119, 



121 

 effect of variety, 119, 122 

 excision of, 393, 398, 399, 404 

 shape in lettuce in relation to 



heading, 119 

 Leaf growth 



effect of amino acids on, 165 

 effect of cobalt on, 166, 167, 176 

 effect of coumarin on, 165, 166 

 effect of gibberellic acid on, 171, 



176 

 effect of indoleacetic acid on, 



172-176 

 effect of kinetins on, 167, 168 

 effect of light on, 161-178 

 effect of purines on, 165, 168- 



170, 175, 177 

 effect of x-irradiation on, 173- 



175 



