198 



INDEX 



Phloem, injury causing water-shortage, 



19 

 Photosynthesis, 50 



and leaf colour, 134 



effect of defoliation on, 29 



highest-recorded value, 51 



possible growth-limitation in early 

 morning by, 30 



stomatal movements affecting, 42 

 Phylogeny of fuzz, 102, 144 



of Gossypium, 5 



of leaf, 95 



of parents of hybrids, 130 

 Physical explanation of nuclear 



division, 10 

 Physics, of soil, 44 

 Physiological drought, 42 

 Physiology. See the Individual, 6 



interpreting fluctuation, 90 



differences between "varieties," 106 



supplementary data from Genetics, 

 175 

 Picking, inferior to bolling-curve,-57 



-date, effect of district on, 53 

 Pickings, varying strength of, 85 

 Pits, simple, in lint cell-wall, 84 

 Pliny, 1 



Plot, the breeding, kinds of cotton on, 

 123 

 more vicinism in, 119 

 Poisons, effect on stomata, 41 

 Pollen, development of, 10 



mixture by, 111 



parent, unknown, 144 



research desirable on, 180 



variety of, in first generation, 124 

 Pollen-tube, branching of 12 



analogy with fungus, 121 

 Pollination, cross. See Natural cross- 

 ing, 117 



mixed, 116 

 method of, 122 



absence of provoking shedding, 69 

 Porometer, the, 40 

 Position, effect on vicinism, 120 

 "Pot-bound" plants in field crop, 



35 

 Pot culture, abnormal at three weeks 



old, 35, 44 

 Potometer, unsuccessful, 45 

 "P.p.p.d," definition of, 55 

 Practical man, the, 66, 106 

 Precision, required for heredity in 



cotton, 128 

 Prepotency of pollen, 122 



Fi pollen, 125 

 Prevention, of natural crossing, 117 

 Price, inflated, of Egyptian cotton, 



178 

 Primitive cottons, 97 



and fuzz, 102 

 Primordia of flower, 6 



of leaves, 158 



Probable error of boll-form, bolt-loculi, 

 99 



of bolls, weight of, 99 



of bolls, number of, 57 



of yield, 57 



of field experiments, 56 



of first-flower date, 98 



of floral organs, 97 



of ginning out-turn, 101 



of height, 93, 109 



of leaf-halves, 50 



of leaf-length, 95 



of lint- length, 83, 104 



of lint-weight, 101 



of maturaticm interval, 66, 98 



of seed, testa, and embryo- weights,100 



of seed-weight, 100 



of shedding (retained flowers), 99 



of sinus of leaf, 96 



of total flowers per plant, 99 



of yield per plant, 99 



percentage, defined, 92 



standardisation of, 91 

 Prodenia littoraiis. See Cotton worm 

 Propagation, rate of, 98 

 Ptolemaic period, 1 

 Pure forms, bred from Egypto-Upland, 



150 

 Pure strain or line, 89 



compared with commercial varieties, 

 107 



origin of, 91 



strains, commercial utilisation of, 178 



Qualitative characters, heredity of, 



133 

 Quality, depreciation of Egypt's crop 



in, 178 

 Quality of lint, inheritance of, 146 

 Quantitative characters, inheritance of , 



150 



Race, the, 89 



Rapid reaction to shedding-stimulus, 68 



Rate of growth, inheritance of , 151, 153 



of propagation, 98 



of root-growth, 37 

 Rattoons, 118 



use of, 128 

 Reaction of environment on organism, 



31 

 Recessive character, contamination by, 



114 

 Reconquest of water-logged soil, 80 

 Record values for photosynthesis, 51 

 Records, of crops, 180 



system of keeping, 132 

 Red-leaf cottons, 120 

 Reduction division, 8 

 Regeneration of root, 79 

 Regression of a fl\ictuation, 108 

 Renewal of seed, 178 

 Reputed species, intercrossed, 127 

 Research, lines for future, 180 



