LIST OF ILLUSTRATIONS 



FIG. PAGE 



The " Short-style " Flower of Cotton . . . Frontispiece 



1-7. Ovule, Seed, and Lint 7 



8-18. The Mechanism of Nuclear Division 9 



19-20. Development of Pollen .9 



21-28. Fertilisation and Embryology 11 



29. Temperature of the Seed Bed 15 



30. The Plant and the Environment. Gezira, Cairo, 1911 . . 16-17 



31. Growth and Temperature of a Fungus . . . . 22 



32. Growth and Temperature of a Root 23 



33. Growth of Stem 28 



34. The Sunshine Effect 29 



35. The Root : Development, Asphyxiation and Regeneration . 34 



36. Seedling 36 



37. Water Jet Excavation of Roots 38 



38. Regeneration of the Root-System ... . . 39 



39. Stomatograph Records 42 



40. Transpiration in Field Crop 46 



41. Internal Temperature of Leaves 49 



42. Comparison of Varieties 57 



43. Specific Growth-habit 59 



44. Flowering Curves. Giza. 1910 63 



45 Mean Flowering Curves in Field Crop, 1909, 1910 and 1911 . 65 



46. Composition of Sheddings 68 



47. Terraced Land. Giza. 1909 .73 



48. Height of Stem .94 



49. Maximum Lint-length of Single Seeds . . ... 103 



50. The Impurity of Commercial Varieties .... Ill 



51. Netted Plants .117 



52a. The Breeding Plot ... 120 



52b. The Breeding Plot 121 



53. Correlation Diagram for Two Pairs of Allelomorphs . . . 131 



