8 
Page. 
Hand-picking of corn 52 
Trap-corn experiments 52 
Early and late cotton 58 
Bacteriological experiments witli insect diseases 59 
Introductory 59 
General precautions 60 
Culture media 60 
Beef broth 61 
Agar-agar 62 
Special apparatus 62 
Observations and experiments 64 
A disease of Plusia brassicce 68 
Discussion of results 69 
ILLUSTRATIONS. 
Plate I. Diagram of cotton field, showing location of trap corn 56 
II. Special apparatus for bacteriological work 62 
