PLATE 25 



Gossypium herhaceum (Columbia variety), showing effect of wilt: 



Wilting plants photographed 15 days after inoculatiou at the hypocotyl with Fusa- 

 rium vasinfecium, strain 1855, isolated from wilting cotton plants. The plants are 

 the same age as the control plants in Plate 24. Natural size. 



