Acclimatization. 



97 



first appearance, have beards; but lose them when thev 

 ripen. In the first year in the new environment prac- 

 tically all the ears with very few exceptions had this 

 character; but in the second year already half were beard- 

 less, whilst in the third year the latter formed the great 



Fig. 21. Rough Awned Wheat of Rivett and ordi- 

 nary German Field Wheat. 



majority; they also differed from the original form in 

 the fact that their seeds had a horny instead of a mealy 

 texture. 



To determine the cause of this degeneration Risler 



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