260 



SOrrilEBN FIELD CROPS 



Bulls of upland eolton are usually of sueli size that froui 40 to 

 110 are required to make a pound of seed cotton. 



When the boll ripens, it splits usually into four or the di\isions, 

 exposing the seed cotton. The parts of the ])od, or Inir, separate 

 more or less completely. If they open wide and the outer walls 

 of the burs curl backward, the seed cotton may be held so 

 slightly that it is easily blown out liv wind or beaten out by rain 

 (Fig. 128). 



