XVI CONTENTS 



CHAPTER XX 



PAGES 



Cotton — The CttLTivATioN of the American Upland Group 341-360 

 Laboratory Exercises, 360 ; Literature, 360. 



CHAPTER XXI 

 Cotton — Harvesting and Marketing .... 361-376 

 Laboratory Exercises, 376 ; Literature, 376. 



CHAPTER XXII 



Cotton — History and Statistics 377-387 



Laboratory Exercises, 387 ; Literature, 387. 



CHAPTER XXIII 



Cotton — Insect Enemies 388-410 



Cotton Boll-worm, 388 ; Mexican Cotton BolI-weevil, 392 ; 

 Insects of Minor Importance, 407 ; Laboratory Exercises, 

 410 ; Literature, 410. 



CHAPTER XXrV 

 Cotton — Fungous and Other Diseases .... 411-420 

 Laboratory Exercises, 420 ; Literature, 420. 



CHAPTER XXV 



Hemp — Cannabis sativa 422-424 



Laboratory Exercises, 424 ; Literature, 424. 



CHAPTER XXVI 



Sweet-potato — Ipomoea batatas 425-456 



Composition and Uses, 428 ; Varieties, 431 ; Soils, Fer- 

 tilizers, and Rotation, 434 ; Cultural Methods, 438 ; Har- 

 vesting and Storing Sweet-potatoes, 447 ; Enemies, 452 ; 

 Laboratory Exercises, 455 ; Literature, 455. 



