200 



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 

 eflect 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, 



37* 

 texture, effect on irrigation method, 



71 

 texture affecting shedding, 70 

 top, not providing water, 78 

 variation in, 56 

 volume required bj' root, 74 

 volume occupied by roots, 35, 63 

 water, change of content, 75 

 water-content, changing near roots, 



43 



-water-content affecting stomata, 41 

 Soil-water, ideal distribution, 76 

 water, problems, 71 

 affected by size of root, 61 

 Sore-shin, 17 

 differentiating effect of, 123 

 restlng-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, S8 

 of internode length, 32 

 of lint-length, 83 

 of maturation-interval, 66 

 Speed, exceptional of nuclear division, 



8, of fertilisation, 12 

 Spinner, scanty information for the, 



55 

 Spinning, beginning of Egypt's reputa- 

 tion, 5 

 " bread and cheese," 105 

 fine ; competition between Egyptian 

 and Georgia's, etc., 5 

 varieties for, 105 

 of Upland replacing Egyptian, 178 

 Spores, micro- and macro-, JO 

 Spot, of leaf, 133 



of petal, inheritance of, 138 

 Stages of development, 14, 54 

 Staleness.of tissue, 25 

 Staling of culture-medium, 22, 24 

 Standard deviatioii, 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, 69 

 Stipule, form, inheritance of, 141 

 Stomata, 38 

 affecting photo-synthesis, 51 

 immature, 40 

 occurrence, 39 

 effect on shedding, 69 

 affecting internal temperature, 50 

 blocked by water, 43 

 closure at Sunset, 43 

 controlling transpiration, 

 regulating transpiration, 46 

 size of, .39 

 Stomatal changes, in aperture, 40 

 under field conditions, 41 

 closure causes rise of temperature, 

 50 

 Stomatograph, the, 41 

 record coincident with photosyn- 

 thesis, 51 

 Strain, pure, 89 



Strains, immune from vicinism, 125 

 StraltoH, 56 

 Strength of lint, 81, 84 



