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. 



(Greatlv reduced, i 



