XVI CONTENTS 



CHAPTER XI 



PAGES 



CLIMATIC RELATIONS 254-277 



Climatic extremes, 271 ; Conditions in the Chernozem 

 and Great Plains, 272 ; Temperature, 273 ; Rainfall, 274 ; 

 The humidity, 275; Comparative humidity of prairie 

 and forest regions, 276 ; The Chaco-Pampean plains, 

 277; Isoclimatic lines, 278; Directions of climatic re- 

 sistance, 279 ; Water requirements of cereals, 280 ; 

 Experiments of the United States Department of Agri- 

 culture, 281 ; Evaporation, 282 ; Winds, 283 ; Sunlight, 

 284; Phenology of the cereals, 285; Variations in the 

 period of growth, 286 ; Seasonal variations in this coun- 

 try, 287 ; Investigations, 288 ; The fruiting period, 289 ; 

 Heat requirements in cereal development, 290 ; Linsser's 

 law, 291 ; Retardation of the harvest, 292. 



CHAPTER XII 

 CEREAL ADAPTATION AND ASSOCIATION .... 278-300 



Adaptation : Cereal regions, 2Q3 ; Russia, 294 ; The 

 United States and Canada, 295 ; Argentina, 296 ; The 

 Balkan-Hungarian region, 297 ; The German -Austrian 

 region, 298 ; The French-Italian region, 299 ; India, 300 : 

 East China-Japan region, 301; The Siberian-Manchu- 

 rian region, 302 ; Russian and Chinese Turkestan, 303 ; 

 The Tibetan-Himalaya highlands, 304 ; The Arabian- 

 Persian region, 305; The Mediterranean region, 306; 

 Abyssinia, 307 ; South Africa, 308 ; Australasia, 309 ; 

 Cereal introductions, 310 ; Suggestions for proper cereal 

 introductions, 311. Environment : Acclimatization, 

 312 ; Change of seed, 313; Principles to be observed in 

 obtaining new seed, 314 ; Effects of environment, 315 ; 

 Environmental experiments, 316 ; Effect upon protein 

 content, 317 ; Cumulative effects in long periods, 318. 

 The Cereal Plant Community : Plant ecology, 319 ; 

 Agronomy or study of the crop, 320 ; The stand, 321 ; 

 Variation in tillering, 322 ; Winter hardiness, 323 ; Dis- 

 tinction of spring and winter varieties, 324 ; Effect of 

 numbers on the food supply, 325 ; Soil sanitation, 326. 



