CEREAL ADAPTATION AND ASSOCIATION 291 



northern Rocky Mountain districts, in central Canada, and 

 in Alaska. The best cereals in California have come 

 from Mexico, Australia, the Mediterranean region, and 

 Russian Turkestan. Abyssinian varieties seem to be 

 adapted there also. 



ENVIRONMENT 



312. Acclimatization. The firm establishment of an 

 introduced cereal crop is much more than the mere intro- 

 duction, and is sometimes a tedious task, requiring years 

 for success. A good example is the introduction of durum 

 wheat into the United States from Russia (155). The 

 process of introduction may become one of acclimatiza- 

 tion. The difference between a simple introduction and 

 acclimatization may be illustrated by the case of the Swed- 

 ish Select oat (163). This is a pure-breo). oat, developed 

 in Sweden. It was first introduced direct from Sweden 

 to the United States, and found not to be well adapted, 

 as might have been predicted from the dissimilarity be- 

 tween the two countries. During many years, the same 

 variety was grown in Finland and Petrograd Govern- 

 ment, Russia, under the name Swedish Select, and fur- 

 ther selected and acclimatized. This improved strain 

 was then (1900) introduced to this country, and gave 

 excellent results. 



313. Change of seed. A change of seed is something 

 very different from a change of variety. Often an im- 

 provement of a cereal crop may be made by introducing 

 better adapted varieties, but a change of seed within the 

 same variety is not often an advantage, and may be 

 a detriment. 1 There are certain special cases, however, 



1 In case of the potato crop, often mentioned as a striking 

 exception in favor of a change of seed, it should be noted, of 



