INTRODUCTION. 5 
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*Fic. 1.—Cross-section of potato stem of plant 13 (1895) inoculated with Bact. solanacearum by‘needle-pricks 
May 27, and fixed in strong alcohol June 11. 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). . 
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