PLATE 28. 



Pear-shoots blighted by Bacillus amylovorus. 



inoculations by needle-pricks on rapidly growing stems. The infectious material came from a green apple. The poured plates yielded practically pure cultures and 

 the inoculations were made directly from colonies in these plates. Of I 2 inoculations (8 shoots, 4 fruits) II were successful. Needle-pricks made July 10. 1905. 

 Photographed July 20. The lower leaves were still green ; the tops (A and A) had shriveled and browned ; the bacteria had passed downward in the bark to 

 points below B and B, and they had also run out into the petioles (P and P) and had browned them, but the blades of these leaves were still green. 



