1334 



BIOLOGICAL EFFECTS OF RADIATION 



Endodermis, effect of light on, 830 

 Energy, between atoms, 255 

 Energy relations, in photosynthesis, 

 1045; photosynthetic efficiency, 1045 

 Environmental factors, and day-length, 



697 

 Enzymes, absorption spectra, 1153, 1158, 

 1159 

 crystalline, 1158, 1159 

 irradiation of, 1151-1165 with mono- 

 chromatic light, 1154; with sun- 

 light, 1151; with ultra-violet, 1154 

 Epidermis, effect of ultra-violet on, 834- 



838 

 Ergosterol, 323, 330 



absorption of radiation by, 326 

 activation (irradiation), 323; discovery 

 of, 324; factors affecting, 328; 

 physical chemistry of, 327; prod- 

 ucts of, 329; temperature coeffi- 

 cient of, 328 

 Erythemal system, units, 204 

 Etiolation, 734, 830; theories regarding, 



738; value to plant, 739 

 Euglena, response to light, 578 

 Eye, irradiation of, 505 

 Eye colors, dominant, 1193 

 Eye spots, function of, 579, 583 



Fasciation, of green plants, by X-rays, 

 974, 976 



Fat, freed by irradiation, 655 



Fermentation, effects of, radiation on, 

 904, 1059-1072; ultra-violet light 

 on, 1068; visible light on, 1068; 

 X-rays on, 1070 

 in fungi, 904, 905, 908 

 heat effects in, 1070 



Fertilization, effects of radiation on, 391 



Filters, 159-170, 276; Christiansen, 164, 

 167, 168; colored, in re growth of 

 seed plants, 763; heat-absorbing, 

 162; monochromatic, 164, 165; short- 

 wave cut-off, 159, 160; water, 163 



Filtration, of gamma rays, 105; of X-rays, 

 104 



Flagellates, response to light, 578 



Flower formation, effects of ultra-violet 

 on, 877; light intensity on, 752 



Vol. 1 contains pp. 1 to 676 



Flower and fruit development, effects of 

 X-rays, 976 



Flowering and fruiting, in re photo- 

 periodism, 685 



Fluorescence, 31-36, 265; of bacteria, 

 1139; of chlorophyll, 1030; of plant 

 parts under ultra-violet, 876 



Fragmentation, chromosomal, 1169, 1182 

 in re irradiation, 1282-1284, 1291, 1292 



Frequencies, 7, 13 



Fresnel's law, 260 



Fruiting, in fungi, 895 



Fungi, effects of radiation on, 889-918; 

 form of fruiting structures, 895, 905, 

 907; growth rate, 890, 897; myce- 

 lium, 889; pigmentation, 889; salta- 

 tions, 903, 906; spore discharge, 901; 

 spore germination, 901, 908; spore 

 production, 898, 908; zonation, 895 

 effects of radium on, 907; ultra-violet 

 on, 889; X-rays on, 904 



Fusion, in re irradiation, 1283, 1284, 1291 



G 



Gamma ray spectrum, 15 



Gamma rays, filtration of, 105; ionization 

 of air by, 114 



Gastro-intestinal tract, irradiation of, 

 494; colon, 499; esophagus, 495; gall 

 bladder, 500; liver, 500; pancreas, 

 499; salivary glands, 495; small 

 intestine, 496; stomach, 496; upper 

 portions, 494 



Gastrulation, effects of radiation on, 396 



Geiger-Miiller counter, 921, 935 



Gelation, of protoplasm, 649 



Gene, distribution, 1311; number, 1321; 

 size, 1323; mutations, 1282, 1292 



Gene changes, and chromosomal break- 

 ages, 1192 



Genetic maps, 1182 



Germination (seeds, fruits), effects of 

 visible spectrum on, 791-827; con- 

 ditions modifying, 793; dosage, 817; 

 historical, 791; regions of spectrum 

 concerned, 815; seeds favorably 

 affected, 793, 796; seeds inhibited, 

 811, 814, 815; theories of action, 818 

 of fungus spores, 901, 908 

 of seeds, in re ultra-violet, 853; in re 

 X-rays, 963 



: Vol. 2, pp. 677 to 1330. 



