ILLUSTRATIONS 



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 Plate I. Upper surfaces of cauliflower leaves, showing natural infection with 



Bacterium maculicolum 16 



II. Under surfaces of cauliflower, showing midribs spotted by natural 



infection with Bacterium maculicolum 16 



III. Under surfaces of cauliflower leaves from hothouse, inoculated with 



Bacterium maculicolum 16 



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6 



