CONTENTS 



CHAPTER I 



CLASSIFICATION AND VALUE OF FIELD CROPS 



Classification by use, 1 ; Classification for the study 

 of cropping systems, 2; Important botanical groups, 3. 

 Value of Field Crops: Rank of the cotton-belt states, 

 4; Importance of field crops in the cotton-belt, 5. 



CHAPTER II 



DESCRIPTION OF THE COTTON PLANT .... 

 The root-system, 6; Types of roots, 7; Functions of 

 the root-system, 8; The stem, 9; The branches, 10; 

 The leaves, 11; The vascular system, 12; Air cavities, 

 13; The peduncles, 14; The flowers, 15; The bolls, 16; 

 Number of bolls to the plant, 17; The seed, 18; The 

 lint, 19; Length and strength of fiber, 20. 



CHAPTER III 



PHYSIOLOGY OF THE COTTON PLANT 



The plant structure, 21; The living substance in the 

 plant, 22. The Composition of the Cotton Plant: Com- 

 position, 23; The essential constituents, 24. Nutri- 

 tion: The absorption of food, 25; The taking up of 

 carbon, 26; The necessary energy, 27. The Giving 

 off of Water: 28. Reproduction: The reproductive or- 

 gans, 29; The pollen-grains and egg-cells, 30; Fer- 

 tilization, 31; The embryo, 32. 



CHAPTER IV 



THE PRINCIPAL SPECIES OF COTTON . ' . 



Malvaceae or mallow family, 33; The genus Gos- 

 sypium, 34; Number of species, 35; Classification of 



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