220 



THE DEVELOPMENT OF EAW COTTON 



Seed-breeding, 167 

 Seed-coats, 70 



origin of, 61 



Seed-cotton, combed, 184 

 storage of, 140 

 study of, 179 

 Seedlings, 23 

 Segregation, 15 

 Selection, 13, 20 



natural, 17, 129 

 Self-fertilization, 168 



a test for constitution, 12 

 Senescence, 44, 96, 99 

 excluded, 114 

 and lint, 76 

 and out-turn, 103 

 Sex-cells, 59 

 Shade, 121 



Shedding, 47, 64, 67, 58, 174 

 Shift of curves, 98 



of length and strength curves, 



113 



Shuffling of characters, 128 

 Spacing of plants, 34, 121, 157 

 Species and subspecies, 11 

 Spinner, 116 



grower, and scientist, 58 

 benefit of controlled seed to, 



169 



Spinners' testing-house, 169 

 Spinning, 55, 146 

 statistics, 189 

 and grading, 145 

 and growing, 125 

 processes, 123 

 Skill of grader's hands, 195 

 Slide-rule balance, 181 

 Soil, suitable kinds, 32 

 temperature, 23 

 tilth, 28 

 variations, 159 

 Sowing, 23 

 Sowing date, 157 

 Stamens, 60 

 Starvation of plant, 31 

 Statistics, 95 

 Statistical evidence, 169 

 Stem, temperature effects on, 26 

 Stomata, 29 



Storage of seed-cotton, 140 

 " Strength," meaning of, 126 

 Strength, grader's, 144 



and breaking-strain, 108 



Strength, hair. See also Thickness 

 of lint-hair wall 



(hair), 141 



fluctuation in, 116 



of hair and weight, 106 



various kinds, 141 



regularity of, 109 



of yarn, 141, 146 

 Strong lint hairs, 98 

 Struggle for existence, 121, 150 

 Study, methods of, 171 

 Stunting, 23 



Style, organ of flower, 61 

 Subjectivity in cotton, 162 

 Subsoil water. See Water-table 

 Sunshine effect, 30 

 on lint, 74 

 Supply of cotton, 153 



; Taggart, W. Scott, 56, 82 

 Target diagrams, 130 

 Technical terms, definition of, 126 

 Temperature, 22, 117 

 excessive, 25 

 losing control, 93 

 of the plant, 26 

 Tester, automatic, for breaking 



strain, 189 

 Testing by impact for breaking 



strain, 108, 191 

 by spinning, 169 

 varieties, with little seed, 166 

 Texture of lint-hair wall, 141 

 Thickness of lint, 74, 77, 79, 



141 

 of lint-hair wall. See also 



Hair strength 

 Thomas, Harold C., 195 

 Time spent in making determina- 

 tions, 181, 185, 189 

 Tree cottons, 3, 45 

 Trial and error, 157 

 Twist, 78. See Convolutions 

 in spinning, 147 



Uniformity, 116, 147, 150 



affected by cultivation, 129 

 of strength in grading, 109 

 UnitedlStates, 28, 35, 140 

 cottons studied, 58 

 crop, 157 



dependence upon, 154 

 Uplands group of cottons, 6 



