2OO 



INDEX 



Sinus of leaf, 96 



length, inheritance of, 158 



probable error of, 96 

 Size of boll, inheritance of, 161 



of leaf, inheritance of, 156 



of root system, limiting growth, 36 

 Sleep-movement, 88 

 Soil constitution, 88 



deficiency in oxygen, 38 



depth of, effect on root system, 75 



disturbance, to avoid, 45 



dry, causes over-heating of tissues, 50 



effect of disturbing, 71 



effect of texture, 31 



humidity of, 36, 38 



importance of deeper layers, 78 



main control transferred to, 54 



physics, 45 



resistance to root- growth, 33 



temperature, 15, 16 



temperature as affecting drainage, 



texture, effect on irrigation method, 



texture affecting shedding. 70 

 top, not providing water, 78 

 variation in, 56 

 volume required by root. 74 

 volume occupied by roots, 35, 63 

 -water, change of content, 75 

 -water-content, changing near roots, 



43 



-water-content affecting fctomata, 41 

 Soil-water, ideal distribution, 76 

 -water, problems, 71 

 affected by size of root, 61 

 Sore-shin, 17 



differentiating effect of, 123 

 resting stage, 18 

 rhizomorphs, 18 

 vitality of, 18 

 Sowing, 15 



tendency to over-early, 53 

 date, critical, 53 



effect of district on, 53 

 effect on first-flower, 53 

 effect on growth curve, 61 

 without influence on shedding, 70 

 distance of, affecting ginning out- 

 turn, 86 

 affecting height of flowering 



curve, 63 



affecting root-form, 34 

 affecting shedding, 69 

 effect on ginning out-turn, 101 

 effect on height, 93 

 effect on yield, 98 



Species, grown on breeding-plot, 123 

 elementary of Hindi, 106 

 reputed inter-crossed, 127 

 sub-, of Nyam-Nyam cotton, 97 

 Species hybrids, 127 ; more complex 

 than variety-hybrids, 144 



Specific differences in first-flower date, 



52 



gravity of lint, 81 

 length of hypocotyl, 31 

 nature of flowering curve, 61 

 of growth curve, 58 

 of internode length, 32 

 of lint-length, 83 

 of maturation-interval, 66 

 Speed, exceptional of nuclear division, 



8 ; of fertilisation, 12 

 Spinner, scant}- information for the, 



>5 



Spinning, beginning of Egypt's reputa- 

 tion, 5 



"bread and cheese," 105 

 tine ; competition between Egyptian 

 and Georgia's, &c.. 5 

 varieties tor, 105 



of Upland replacing Egyptian, 178 

 Spores, micro- and macro-, 10 

 Spot, of leaf, 133 



of petal, inheritance of, 138 

 Stages of development, 14, .~>4 

 Staleness of tissue, 25 

 Staling of culture- medium, 22. 24 

 Standard deviation, 92 

 Staple, fine, with heavy yield, 106 

 State control of seed, 3 



supply of seed, 178 

 Statistical constants. See Correlation 



and Probable error 

 expression of fluctuation, 92 

 methods, 56 



Statistics of gametic impurity, 110 

 in Mendelism, 132 

 of natural crossing, 115 

 Stem height, inheritance of, 150 



length of, in seedling, 31 

 Stimuli, transmission of, 67, b'9 

 Stipule, form, inheritance of, 141 

 Stomata, 38 



affecting photosynthesis, 51 

 immature, 40 

 occurrence, 39 

 effect on shedding, 69 

 affecting internal temperature, 50 

 blocked by water, 43 

 closure at sunset, 43 

 controlling transpiration, 44 

 regulating transpiration, 46 

 size of, 39 

 Stomatal changes, in aperture, 40 



under field conditions. 41 

 closure causes rise of temi>erature, 



50 

 Stomatograph, the, 41 



record coincident with photosyn- 

 thesis, 51 

 Strain, pure, 89 



Strains, immune from vicinism, 125 

 Stratton, 56 

 Strength of lint, 81, 84 



