xii LIST OF ILLUSTRATIONS 



FIG. I'AOK 



5. ARRANGEMENTS OF THE SPACING IN FIELD CROP - 34 



6. EFFECT OF SPACING ON YIELD - 35 



7. ABSORPTION OF WATER BY THE ROOT SYSTEM 37 



8. TYPES OF BRANCH-SCAFFOLDING - 42 



9. SUCCESSION OF FLOWERS - 44 



10. PLANT-DEVELOPMENT CURVES AND THEIR USE IN FORE- 



CASTING 47 



11. MICROSCOPIC DETAILS 52 



12. PITS - 75 



13. STRUCTURAL DEVELOPMENT OF THE BOLL 80, 81 



14. DAILY FLOWERS, 1912, EXPERIMENTAL RESULTS 90 



15. DAILY PICKINGS, 1913, EXPERIMENTAL RESULTS - 110 



16. TARGET DIAGRAMS SHOWING COMPOSITION OF VARIETIES 



AND PURE STRAINS - - 134 



17. VARIETY TESTING BY BOLLING CURVES - - 166 



