XXll CONTENTS 



1 



rXGB 



IV. WEEDS, FUNGOUS DISEASES AND INSECT ENEMIES. j 



Weeds 306 j 



Fungous diseases, p. 306 ; Insect enemies, p. 307. 



CHAPTER XX.— OATS. 



I. HARVESTING AND USES. 



Time and Method of Harvesting . . . . .308 



Use 308 



Oats for human food, p. 309 ; By-products, p. 310. 



II. PRODUCTION AND MARKETING. 



Oat Crop of the World 310 



Oat crop of the United States, p. 310; Progress of 

 oat production, p. 311; Yield per acre, p. 311; 

 Center of production, p. 3 1 2 ; Export of oats, p. 

 312 ; Commercial grades, p. 313. 



III. HISTORY. 



History 313 



Practicums 314 



Method of cross-fertilization, p. 314; Plant in the 

 field, p. 314; Mature dried plant in laboratory, p. 

 315; Soil fertility in relation to oats, p. 3 1 5 ; Influ- 

 ence of size of seed on early stages of plant growth, 

 p. 3 1 6 ; Influence of treatment of seed upon ger- 

 mination, p. 316. 

 Collateral Reading 317 



CHAPTER XXI.— BARLEY. 



I, STRUCTURE AND COMPOSITION. 



Relationships 318 



The plant, p. 318 ; Inflorescence, p. 318; Grain, p. 



