PEDIGREE 5 



and some indigenous African tree cottons (Fig. 1). The 

 evolution of " lint " had possibly taken place before 

 this group-parent was thrown off. 



Probably much later in the world's history the primitive 

 stock threw off another modification, in which the leaves 

 were larger and more or less cut into pointed lobes, the 

 blotch of crimson on each flower was rather smaller, and 

 the whole plant was less wiry than in the Asiatic group. 



Fro. 1. COTTON LEAVES. (VERY DIAGRAMMATIC.) 



To illustrate the general differences in form and size between the three 

 main groups of cotton-plants. Above, Asiatic ; left, Upland; right, 

 Peruvian. 



While forms which may well represent the primitive 

 ancestor of the Asiatic group are still surviving, no ap- 

 parent representative of this next offshoot is known. In 

 all probability it did not long exist as a separate form, but 

 underwent another pedigree-cleavage, into plants with 

 more deeply cut leaves which retained the yellow flower, 

 and plants with the less cut leaves which lost the yellow 

 flower colour (Fig. 1 and PL III.). The descendants 



