PLATE i8 



A. — A common result of downy mildew attack. In both maize plants shown the 

 growth of the intemodes has been checked so that the leaf sheaths overlap and the 

 unexpanded tassel is still partly surrounded by them. The striping of the leaves and 

 their stiff, brittle character are easily seen. Both plants were entirely barren. 



B. — A maize plant seriously injured by the downy mildew stands in front. Its 

 sttmted habit and striped leaves are striking evidences of the disease. Of the two 

 abnormal ears, the one at the right was entirely sterile while the one from which the 

 husks have been removed bore a few viable seeds. In the same hill, behind, is a 

 healthy plant, only the lower part of which is shov\"n. 



C. — One hill in a maize plot which lost heavily from attacks by the downy mildew. 

 The diseased plant at the left, although nearly as tall as the healthy companion at the 

 right, is less strong and has a poorly developed ear which is only partly inclosed in 

 husks and bears very few kernels. 



