Bu 



U. S. Dept. of Agriculture. 



Plate III 



Fig. 1 .—Corollas of American Varieties of Nicotiana tabacum, Showing Various 

 Degrees of Mottling Produced by the Mosaic Disease. 



The dark areas represent the normal pink color; the light or white areas indicate a partial or 

 complete absence of red. A, Normal pink blossom; B, mosaic blossom which is entirely white. 

 (About natural size.) 



Fig. 2.— Buds of Nicotiana tabacum, Showing Distorted and Other Depauperate 

 Buds Produced by the Mosaic Disease (A) and Normal, Healthy Buds (B). 



(Ab< 



natural size.) 



