Pycnosis 58, 59, 66, 67, 77 

 Quamoclit coccinea 104 



Radiation, ionizing 37, 111 



natural HI, 113 



quality of 97-113 



quantity of 97-113 



short-wave 43, 98, 101, HI 



ultraviolet 37 

 Radiogenetics 33 

 Radiomorph 42, 44 

 Radiophylaxis 98 

 Radiosensitivity 6, 13, 14, 21, 25, 46, 62, 



73, 74, 76, 101-105, 107, 108 

 Radish 5 



Radium 34, 35, 44, 62, 98, 102, 103, 113 

 Raphanus 6 

 Ray, cosnnic 111-113 



gamma 111, 113 



ultraviolet 99-101 



X ray see X ray 

 Respiration 11-13, 102 

 Retention of effect 109 

 Rhoeo discolor 69 

 Rhubarb 13 

 Riccia fluitans 34 

 Rice 6 



Roentgen unit 3, 107 

 Root 6, 9, 13, 18, 25-27, 58, 59, 66, 67, 69, 



70, 72, 73, 77, 79, 80, 82-84, 87, 98, 103, 



104, 108-110 

 Rootlet 10, 11, 18, 20, 47, 58, 59, 66, 72, 73 

 Rye 6, 10, 11, 15, 16, 18-21, 25, 26, 38, 46, 



47, 77-82, 86, 87, 100, 104, 108 

 Rye grass, Vesterval'd 26 



Saccharomyces cereviseae 37 



Salt, heavy metal 35, 36, 76 



Saxifraga umbrosa 57 



Scrophulariaceae 105 



Secale cereale 69 



Seed 5, 7, 8, 9, 11, 12, 17-21, 23-26, 35, 



37-39, 42-45, 47, 49, 58, 66, 69, 78, 82, 



84, 86, 98, 102-105, 107-109 

 Seedling 4, 13, 98, 102-105, 108, 109 

 Sex, change of 46, 49, 51-53, 97 

 Sinapis alba 10 

 Sinapis arvensis 6 

 Size, cell 46, 58, 59, 80, 81, 108 



plant 5, 6, 13, 37-39, 41, 44, 46, 47, 

 53, 84, 87, 104 

 Skin erythema dose (HED) 3, 107 

 Snapdragon 33, 37, 43, 45, 62, 63, 99, 100, 



104, 105 

 Solanaceae 13, 105 

 Solanum annum 41 

 Solanum melongena 41 

 Soya r2, 98 

 Spartina townsendii 111 

 Specificity, genetic 46 

 Speltoid 37, 38 

 Spinacia oleracea 104 

 Sphaerocarpus donnellii 46 



Spinach 39, 104 



Spirogyra 57, 58 



Spore 46, 63, 73 



Sprout 5, 7, 9-11, 13, 15, 18, 20, 24, 27, 37, 



40-42, 45, 47, 57, 72, 73, 78, 104 

 Squash 5 



Stalk, secondary 24 

 Stamen hair 57 

 Starch 12, 61 

 Stem 9, 10, 13, 17, 20, 26, 27, 37, 39-42, 



44, 47, 50, 53, 104, 108 

 Stem hair 57 

 Stimulating dose 4, 8, 9, 14, 15, 23-25, 83, 



86 

 Sugar content 11, 12 

 Sunberry 13, 15 

 Sunflower 5, 11, 13 

 Survival, differential 51, 53 

 Sweet pea 13 



Tea 53 



Temperature 5, 6, 9, 74, 102, 113 



Temperature coefficient 102 



Thallus 34 



Thistle 13 



Time, exposure 6, 7, 10, 12, 40, 59, 97 



Timothy 27 



Tobacco 13, 14, 34, 37, 41, 53, 63, 112 



Tomato 12, 39, 43 



Tradescantia bracteata 71 



Tradescantia reflexa 73 



Tradescantia selloi 57, 62 



Tradescantia virginiana 57 



Trillium 77 



Triticum dicoccum 106, 107 



Triticum durum 12, 67, 84, 106, 107 



Triticum monococcum 106 



Triticum sativum 7 



Triticum vulgare 6, 9, 67, 84, 106, 107, 109, 



112 

 Tuber 10, 12, 40 

 Tulip 13, 39, 70 

 Tulipa silvestris 69 



Vallisneria spiralis 5, 57, 63 



Viability 23, 42, 44, 46, 47, 59, 69 



Vicia 77 



Viciafaba 5, 7, 8, 10, 13, 14, 58, 59, 65-67, 



71-73, 97, 98, 102, 103 

 Vicia sativa 5, 7, 8 

 Viscosity, protoplasmic 62 



Water 5-8, 13, 23, 24, 103, 105, 107 

 Wheat 7, 9, 11, 12, 19, 23-26, 37-39, 67, 77, 

 84-87, 103, 108, 110 



X ray, constancy of 8 

 definition of 2 

 detection of 2 

 discovery of 1 

 effect of see specific subject 

 formation of 2 



121 



