SUBJECT INDEX 



1335 



Gesneriaceae, effects of light on germina- 

 tion, 796 

 Glass, ultra-violet transmitting, 869 

 Gonadal system, irradiation of, 517; 



ovary, 517; testis, 517 

 Grenz rays, 79 



Growth (and development), in plants, 



in continuous illumination, 715-725; 



with supplemental and artificial 



illumination, 717 



effects of light intensity on, 728, 735, 



737, 743 

 in re regions of spectrum, 764 

 in re ultra-violet, 853, 860 

 in re ultra-violet transmitting glass, 

 869 

 Growth movements, 1073-1091 {see 

 Phototropism); effects of X-rays on, 

 972 

 Gro\\i;h rate, of fungi, 890, 897; light 

 intensity and, 1076; wave-length 

 and, 1076 

 Growth relations, in re photoperiodism, 



687 

 Growiih-response, to radium, 999 

 Growth substance, 1083 

 Gurwitsch phenomenon, 921 

 Gynandromorphs, induction of, 1171 



H 



Haploidy, 1281, 1288 



Heart, irradiation of, 501 



Heat, of reaction, 254 



Helix, response to light, 594 



Hematopoietic system, effects of irradia- 

 tion on, 511; bone marrow, 513; 

 coagulating power, 515; foreign- 

 body reaction, 515; red blood 

 cells, 512; reticulo-endothelial sys- 

 tem, 515; sedimentation rate, 516; 

 spleen and lymph nodes, 511; white 

 blood cells, 512 

 introduction of radioactive material 

 into, 516 



Hemolysins, 364, 372 



Heredity, in plants, effects of irradiation 

 on, 1004 and photoperiodic response, 

 701 



Hertzian waves, 14 



High voltage, equivalent, 49, 58; recti- 

 fiers, 44; wave form, effect of, 47 



Vol 1 contains pp. 1 to 676 



H-ion concentration, effects on irradia- 

 tion of bacteria, 1128; of enzymes, 

 1154; 1156, 1158, 1159 



Histological effects (plants), of darkness, 

 830; of light on tissues, 829; of 

 regions of visible spectrum, 831- 

 834; of ultra-violet, 834-838; of 

 X-rays, 977 



Huygens' principle, 4 



Hydrozoa, regeneration, 413; effects of 

 radium on, 419; effects of X-rays 

 on, 415 



I 



Illumination, artificial, and day-length, 



695, 700 

 Induction, photoperiodic, 694 

 Induction period, 271 

 Infra-red, 14; chemical reactions and, 257 

 effect on photosynthesis, 1038 

 green plants and, 841-852; injury from, 

 849; transpiration effects, 846 

 Inhibitors, photosynthesis and, 1034 

 Insects, response to light, 599 

 Intensity, of radiation, 96; effective, 110 

 distribution, and wave-length, 153 

 of total solar radiation, on horizontal 

 surface, 212; seasonal variations 

 by weekly averages, 216, 217; 

 daily variations by hourly aver- 

 ages, 219-221; effect of cloudiness, 

 223, 224; variations with geo- 

 graphical position, 223 

 Interchanges, chromosomal, in maize, 



1302 

 Intestinal tract, 494 {See also Gastro- 

 intestinal tract) 

 Inverse square law, 96 

 Inversion, chromosomal, 1170; in maize, 



1297-1310 

 Invertebrates, response to light, 573-623 

 Ionization, by alpha particles, 559, 568 

 biological effects and, 87-122 

 energy absorption and, 307 

 fundamental character of, 87 

 importance in irradiated organism, 115 

 by light, 18 



significance of measurements of, 111 

 by X-rays, 46 

 Ionization chambers, calibration of, 68, 



74 

 ; Vol. 2, pp. 677 to 1330. 



