PLATE 20 
Increased susceptibility to Rhizopus of seed injured by dry storage after formalde¬ 
hyde treatment. After treatment some of the seeds were washed in water, some left 
unwashed, md all were dried for one month. 
A. —Treated with i to 20 formaldehyde, dried unwashed; germination 32 per cent. 
B. —Treated with 1 to 20 formaldehyde, washed before drying; germination 76 
per cent. 
C. —Treated with 1 to 40 formaldehyde, dried unwashed; germination 52 per cent. 
D. —Treated with 1 to 40 formaldehyde, washed before drying; germination 74 
per cent. 
Control germinated 74 per cent 
29669°—21-3 
