INTRODUCTION. 



Fig. 



*FiG. I.— Cross-section of potato stem of plant 13 (1895) inoculated with Bad. solanacearum by needle-pricks 

 May 27, and fixed in strong alcohol June 1 1 . Outer tissues are very little affected except on one side (top of drawing) 

 where there is much disorganization. At X there is a deposit stained red by safranin. This local red stain occurs 

 here and there in other parts. Twelve crystal-sand cells occur in the outer phloem. Stem hollow. Actual diameter 

 of section in longer axis, 4.5 mm. Slide 194(2). 



