ILLUSTRATIONS 



PLATES. 



Page. 

 Plate I. Mature unopened cotton bolls — Parker, Jones Improved, Moore 



Excelsior, King, and Seabrook Sea Island 48 



II. Mature unopened and opened cotton bolls — Griffin and Allen 



Improved 56 



III. Fig. 1 . — Field infected by wilt and root-knot. Fig. 2. — Roots of Iron 



cowpea. Fiw. 3. — Root-knot on Wonderful cowpea 64 



TEXT FIGURES. 



Fi<;. 1. Florets or seeds of rescue grass 6 



2. Seeds of chess 7 



3. Upright chess 7 



4. Map showing districts into which the United States has been divided 



for seed-distribution purposes 23 



5. Hyacinth, tulip, and narcissus bulbs 47 



6. Row of Rivers Sea Island cotton in wilt-infected field planted with 



rows of ordinary Sea Island cotton 60 



4 



