80 KNAPP METHOD OF GROWING COTTON 



after growing it for one or two seasons, give 

 it their own name or some local name for 

 commercial purposes. 



Classification of Varieties. There are several 

 methods of classification of American upland 

 cotton. They may be classified according to 

 conformation of stalk, length of staple, earli- 

 ness, size of boll, and percentage of lint. 



J. F. Duggar, Director of Alabama Experi- 

 ment Station, Bulletin 140, divides American 

 upland into eight groups. His classification 

 with description of each group is as follows: 



(1) Cluster varieties, or Dickson type. 



(2) Semi-cluster varieties, or Peerless type. 



(3) Rio Grande varieties, or Peterkin type. 



(4) The King-like varieties, or King type. 



(5) Big Boll varieties, or Truitt type. 



(6) Long Limb varieties, or Petit Gulf 

 type. 



(7) Intermediate varieties, or various types. 



(8) Long Staple Upland varieties, or Allen 

 type. 



The lines of demarkation between these 

 groups are not always clear and distinct; one 

 group often merges into another by almost 



