1342 



BIOLOGICAL EFFECTS OF RADIATION 



Wave-length, of X-rays, effectiveness, 

 459-471; qualitative, 459; quanti- 

 tative, 461 

 of X-rays, in re mutation, 1241 



Waves, and corpuscles, 2 



Winter hardiness, effects of light intensity 

 on, 754 



Worms, response to light, 587 



X 



X-ray, absorption curve, 48; standard 

 absorption curves, 52 



dosemeters, calibration of, 68 



effects of voltage wave form, 47 



generators, high voltage, 44 



ionization chambers, 63, 67, 69, 73 



ionization currents, measurement of, 

 71 



low and high voltage, measurement of, 

 79 



measurement of, 62 



output, measurement of, 78 



production, 43 



quality, measurement of, 45, 66; 

 secondary methods of expressing, 

 59 



quantity, international definition of, 62 



spectral distribution, 46 



standards adopted, 65 



tubes, 43, 67 

 X-rays, 15; absorption, 22 



"back scatter," 102 



biological effects (qualitative), 459; 

 (quantitative), 461 



chemical reactions and, 257 



and chromosomal alterations in maize, 

 1298; deficiencies, 1299; inter- 

 changes, 1302; inversions, 1298; 

 nature of alterations, 1307 



and chromosomal alterations, in plants, 

 1282-1284, 1289, 1291 



degeneration of, 101 



distribution of ions in living matter, 94 



X-rays, effective intensity of, 1 10 

 effective quantity of, 117 

 effects on, bacteria, 1135; cleavage, 

 394; differential sensitivity in 

 embryonic development, 401, 

 (later stages) 397; fermentation, 

 1070; fertilization, 389; fungi, 904; 

 gastrulation, 396 



effects on, green plants, 961-985; 

 cytology, 978; flower and fruit 

 development, 976; germination, 

 963; histology, 977; morphology, 

 973; physiology, 962; respiration, 

 972, 1063 



emission spectra of, 24 



filtration of, 104 



influence of matter, on the intensity of, 

 99; on the quality of, 100 



intensity of and inverse square law, 96 



in re mutation (in animals), 1209; 

 "direct effects," 1246; discovery of 

 effect, 1210; induced changes of 

 susceptibiHty, 1244; intensity rela- 

 tions, 1238; mode of action, 1236; 

 time factor, secondary reactions, 

 1243; wave-length dependence, 

 1241 



in re mutation (in plants), 1263-1280; 

 nature of transmutation, 1273 



production of, 25 



in protein irradiation, 307, 314 



regeneration effects, 411-457 {see 

 Regeneration) 



scattering, 39 



wave-length dependence of, 459 



Yeast in mitogenetic radiation, as 

 detectors, 924; as senders, 941 



Zonation, in fungi, 895 



Vol. 1 contains pp. 1 to 676; Vol. 2, pp. 677 to 1330. 



