Bui. 40, U. S. Dept. of Agriculture. 



Plate V. 



Fig. 1 .—Scion of .Nicotiana glauca (A) which has been Grafted upon a Mosaic 

 Plant of Nicotiana rustica (B). 



Although the stock is badly diseased the graft shows no visible symptoms. (Reduced.) 



Fig. 2.— Healthy and Mosaic Plants of Nicotiana longiflora. A, Healthy Plant; 

 B, Mosaic Plant Produced by Artificial Inoculation. 



(Greatly reduced.; 



