LIST OF ILLUSTRATIONS 



PIG. PAGE 



1. Diagram showing relative value of field crops in United 



States and in cotton-belt ..... 5 



2. Diagram showing the total value of all crops and the rela- 



tive value of the leading crops for each state in the 

 cotton-belt 7 



3. Stalk of Lone Star upland cotton, with (a) vegetative and 



(b) fruiting branches from the same node. (U. S. 

 Dept. Agr.) 13 



4. Flower of upland cotton, from the side, showing the posi- 



tion of the small calyx-lobe opposite the smallest 

 bract (U. S. Dept. Agr.) .... 15 



5. Bracts of upland cotton inclosing bud, showing twisted 



teeth (U. S. Dept. Agr.) . . 15 



6. Stamens and stigmas of Egyptian cotton. (U. S. Dept. 



Agr.) ... 16 



7. Cotton-producing areas of the world. (AfterTodd.) . . 34 



8. Plant of the Jackson Limbless variety of cotton, repre- 



senting the Cluster group (U. S. Dept. Agr.) . . 41 



9. Plant of the Hawkins variety of cotton, representing the 



Semicluster group (U. S. Dept. Agr.) ... 42 



10. Plant of the Peterkin variety of cotton, representing the 



Peterkin group (U. S. Dept. Agr.) .... 43 



11. Plant of the Shine variety of cotton, representing the Early 



group (U. S. Dept. Agr.) 44 



12. Plant of the Truitt variety of cotton, representing the Big- 



boll group (U. S. Dept. Agr.) .... 45 



13. Plant of the Allen variety of cotton, representing the upland 



long-staple group (U. S. Dept. Agr.) ... 47 



14. Cotton seeds with fibers attached. (U. S. Dept. Agr.) . 57 



15. Outfit used in crossing cotton; also buds showing the steps 



hi emasculation and a boll three days after pollination 



(Ga. Station) 65 



xxiii 



