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THE AMERICAN NATURALIST [Vol. LI 



interest to note that plants with a high percentage of 

 awned spikelets in did not tend to give a correspond- 

 ingly high number of awned plants in Fg. Neither did 

 plants with a low percentage of awns in Fg tend to pro- 

 duce more of the awnless or partially-awned types in F3. 



TABF.E TV 



n,hann) of the AtDiIr^.. F. rianfs.-VAevon of the 

 awnless plants were selected for study in F.;, and seed 

 from them was sown in short pedigree rows. The be- 

 havior of these plants is shown in Table V. Five of these 

 awnless plants bred true to the awnless condition, giving 

 a total of 249 awnless plants in F3. The other six broke 

 up into awnless, partially-awned, and fully-awned plants. 

 In no case did the ratio of these types suggest a 1:2:1 

 ratio. When we group all of the plants which are not 

 one hundred per cent, awned, however, and compare them 



