COTTON VARIETIES 



291 



cluster shape. The bolls of Allen Long-staple are slender 

 and small, and the seed are densely covered with white 



Fig. 139. — A Cotton Plant op the Long-staple Upland Type. 



fuzz (Fig. 140.) Other examples are Griffin, which has 

 a very long but weak lint, and bolls that are above the 

 average in size for long-staple varieties. 



On upland soils the long-staple varieties are usually less 

 productive than short-staple cottons and afford a lint 

 shorter than that produced on moist, rich, bottom land. 

 However, the Blue Ribbon, a variety resulting from a cross 

 between a long-staple upland and a short-staple kind, has 

 proved well adapted to upland soils, especially in the Pied- 

 mont Region of the northern part of South Carolina. The 

 chief fault of the last-named variety is its special liability 

 to injury from boll-rot (anthracnose, see Par. 386). 



265. Productiveness of varieties. — The most impor- 

 tant fact brought out by a study of the numerous tests of 



