PLANT BACTERIA. VOL. 3. 



PLATE 31. 









Potato-shoots inoculated by needle-pricks August 8, 1904, with a pure culture of Bad. solanacearum plated from 

 the stem of the Woodridge, D. C., potato shown in plate 30. 



Photographed Aug. 16. Notice particularly the dark stripes extending down inside the stems. The left-hand shoot was pricked in a petiole (the 

 black one at the left midway). The right-hand shoot received one needle-puncture in an upper inteniode. The middle shoot received 10 

 needle-pricks in an upper internode. 



