INDEX 



199 



Research on heredity, necessary facili- 

 ties for, 128 



Resin-glands, 13, 31, 141 

 Resistance of soil to root-growth, 33 

 Resting-stage of sore-shin fungus, 18 

 Reversion, on crossing, 144 



fictitious, 108 



Rhizomorphs of sore-shin, 18 

 Rogueing, from vicinists, 127 

 Root, effect of deficient absorption, 69 



affecting stomatal aperture, 41 



area occupied by, 33, 3.1 



asphyxiation of, 38 



controls fluctuation in seed-weight, 

 101 



depth of, new method, 77 



drying of soil by, 61 



effect of pruning, 68 



growth controlled by temperature in 

 field, 36 



investigation of growth, 37 



limitation, 44 



modification by water-table, 33 



normal colour, 19 



origin of, 32 



penetration of soil by, 33 



regeneration of, 79 



secondaries, 33 



tap root, depth of, 32 



tap-root replaced by lateral, 33 

 Root asphyxiation, effect of Barrage 

 on, 65 



-asphyxiation, effect on C.G. of root, 

 79 



-asphyxiation, of economic import- 

 ance, 176 



-asphyxiation affecting flowering, 62, 

 64 



-asphyxiation in September, 60 



-asphyxiation, causing shedding, 70 



-asphyxiation, effects lessened by 

 wide-sowing, 69 



-interference in field crop, 63 

 Root-development, 75 

 Root svstem, economic importance of, 

 180 



system, centre of gravity of, 75 



system, form of, 33 



system, limited, giving higher out- 

 turn, 101 

 Root-tip, 32 

 Roots, drying soil, 43 



interlacing of, 35, 38 



new, 80 



variable water-supply to, 56 

 Row, observation, 57 



t. s. Sec Angles 

 Sachs, 50 

 Salt, 88 



Sap colour, of petal, 138 

 Saturation of soil, partial, 77 

 with water,. 38 



Sea Island, 3, 105 



Sea Island stock, probable, in hybrid, 



132 

 Sea Islands, impurity of varieties in, 



111 



Seed, inheritance of distribution of 

 lint on, 145 



difficulty of preparing pure, 127 



mixture, 111 



unfertilised, lint of, 83 

 Seed fuzz, fluctuation in, 101 ; Inheri- 

 tance of, 142 

 Seedling, size of, affected by tilth, 31 



length of stem, 31 



Seeds, of Egyptian, with entire fuzz, 

 143 



resembling Hindi, 142 

 Seed-supply, essential feature of, 118 



advantage of simplicity, 179 



project for, 178 



Seed-weight, not correlated with boll- 

 size in pure strains, 100 



affecting lint-length, J73 



correlation with lint-weight, 86 



fluctuation in, 100 



inheritance of, lt>7 

 Segmentation of leaf, 95 

 Segregation, shown by correlation 

 diagram, 159 



absent, in embryo-weight, 100 



of pure from impure strains, 114 



result simulating curve of error, 128 



simple in seed -weight, 173 

 Selection, fallacies of, 107 



natural, effect of, 107 



of heterozygote, 109 



old views on, 108 



the great fallacy of, 123 

 Senescence, of leaf, 48 

 Sennaar, Asiatic type of plant in, 3 

 Sequence of fluctuation independent of 



ontogeny, 97 



Seventy-seven, " 77." See Pure strains 

 Shedding, 67 



caused by root-asphyxiation, 70 



effect of paper bags, 117 



of buds, 63 



of flowers affecting boiling curve, 65 

 Shedding curve, the, 67 



affecting first-flower date, 52 



and strength of lint, 84, 85 



composition of, 67 



determination by subtraction, 66 



mean, 99 



methods of recording, 55 



percentage, 72 



scientific and economic importance 

 of, 67, 70 



two maxima, 72 



Short-style flower, breeding of, 159 

 Significance of field results, 58 

 Single-plant selection, offspring non- 

 uniform, 107 



