PLANT BACTERIA, VOL. 3. 



PLATE 34. 



Tobacco-leaf from the hothouse, showing the typical red-brown shriveled spots of the Granville tobacco 



wilt. The remainder of the leaf was green. 



Bacterium solanacearum abundant in vascular system of the midrib and in many side veins. Plant inoculated in stem, by needle- 

 pricks, on Sept. 23, 1905 using a pure culture of the North Carolina tobacco organism. Photographed Feb. 20, 1906. 

 About one-third natural size. 



