PLATE 21 



Abelmoschus escuknttis, showing effect of wilt: 



A. — Control plant. Photographed at the same time as figure B. X (about) 1/2. 

 B. — ^Wilted plant photographed two weeks after inoculation at the hypocotyl with 

 a pure culture of Verticillium albo-atrum. X (about) 1/2. 



