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 



52u. The Breeding-plot 121 



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



