PLANT BACTERIA. VOL. 3. 



PLATE ?5. 



Two potato-plants badly diseased by Bact. solanacearum (a natural infection). Portsmouth, Virginia, Oct. 1905. 



All of the tubers were internally brown rotted, i. i.. in the vicinity of the vascular ring. The stems were free from superficial ulcers and 

 also the tubers, but in some of the latter the internal brown stain shows through, as in the front tuber and lower tuber of fig. 2. 



