ILLUSTRATIONS. 



Page. 



Plate I. Healthy and diseased leaves of ]\larie Louise violets 16 



II. Young plants of Marie Louise violet from the cutting bed showing 



spot on their leaves 16 



III. A healthy and a naturally infected ^larie Louise plant 16 



IV. A healthy (control) and an artificially infected Marie Louise plant.. 16 

 Y. Plate cultures of Alternaria violx and mycelium and spores from a 



diseased leaf 16 



VI. Development and germination of spores of Alternaria violse and pure 



culture upon Lima bean 16 



Vn. Diseased and healthy leaves of California violet 16 



6 



