202 



INDEX 



Unit plant, computation to, 55 

 Upland by Egyptian, number of allelo- 

 morphs, 124 

 crosses with Egyptian, 127, 130 

 natural crossing with Egyptian, 122 

 similar to Egyptian in reaction to 



sowing date, 53 

 strain, heterozygote in anther 



colour, 140 

 substituted for Egyptian, 178 

 with green lint, 102 

 Upland (King), uniform first-flower, 52 

 flowering of, 61 



longer hypocotyl than Egyptian, 32 

 maturation of boll, 66 

 Uplands, similarity of Hindi to, 

 106 

 impurity of varieties, 111, 138 



Vauje of Egyptian crop, 178 

 Variation, discontinuous, 97 

 Varieties, commercial, general, 105 



commercial, composition of, 89 

 height of, 93 



contamination, not obvious, 1 1 1 



deterioration of, q.v. 



extinct, 105 



minor, 105 



modern, origin of, 4 



new, rate of propagation, 98 

 Variety-trials, 56 

 Variety -type. 111, 

 Vegetate, word mis-used, 43 

 Vegetative uucleii of pollen, 10, 124 

 Vesting, 2 



Vicinism. See, Natural crossing. 

 Vitalism, 88, 108, 110 

 Voting-system, for detecting vicinists, 

 127 



Watek, distribution in soil, 77 

 likely excess of, 54 

 loss from stem, 39 

 of soil in contact with roots, 43 

 principal limiting-factor of soil, 88 

 Watering. See Irrigation 

 Water-supply from root, 28 



contentof plant determines shedding, 



69 

 content of soil, 36, 38 



research desirable, 180 

 logging, effect on root, 38 

 logged soil re-occupied, 80 

 loss, equilibrium with supply, 28 

 loss. See Transpiration, 44 

 shortage, remedied during night, 43 

 and soil-content, 76 

 causing stomatal closure, 41 

 effect on tissue-temperatures, 48 

 through phloem injury, 19 



Water-table, 16, 33 



affecting flowering, 62, 64 



artificial alteration in, 74 



constant, 74 



determination of transpiration by, 

 45 



effect on form of root-system, 75 



effect on root-growth, 38 



effect on strength, 85 



hypothesis, economics of, 176 



period, the, 54 



rise of, 60 



rise inducing shedding, 70, 74 



rising, effect on CO. of root, 79 



rising, kills roots, 79 

 Watt, SirG., 5, 97, 102,130 

 Weather at Cairo, 14, 16, 17, 27, 46 

 Weaving, practised in 16th century, 2 

 Webber, 113 



Weed-cotton, Hindi, 106 

 Weight, dry, of leaves, 50 

 loss from transpiration, 45 

 of lint per seed. See Lint-weight 

 of seed, mean. See Seed-weight, 86 



inheritance of, 167 

 WheldaJ.e, 168 



White-flowered Egyptian, 136 

 Wide-sowing, high transpiration in, 



44 

 Wind, effect on natural crossing, 117 

 effect on shedding, 70 

 effect on leaf-temperature, 48 

 Wood, 56 



" X." See Thermotoxy 

 Xerophyte, cotton a temporary, 14 



Yannovitch, 5 

 origin of, 105 

 yield of, 106 

 Year. See Crop 



Yearly contamination of variety, 114 

 Yield and lint quality, 106 



and shedding, 75 

 Yield, comparison of commercial 

 varieties, 107 

 complex inheritance of, 179 

 decreasing per acre, 176 

 effect of sowing-distance on, 98 

 fluctuation correlated with height, 



95 

 probable error of, 57 

 significance of, 56 

 total, correlation with Flowering, 

 total 



Zygote, 6 



Zygotes, origin of, in "varieties," 



108 

 Zygotic constitution of a " variety," 



108 



11. CLAY AND SONS, LTD., BRUNSWICK ST., STAMFORD ST., S.E., AND BUNGAY, SUFFOLK. 



