618 



BACTERIAL DISEASES OF PLANTS 



V V 



o ipppw 



jf^WF^C,!.: " 5 



' 1 ""^ ' '- 



. * * 



FIG. 451. ^4. Cross-section of a leaf from No. 18, second series, showing 

 superficial origin of a shoot. It arises from the colorless tissue (epidermis) above 

 the palisade tissue (p) which is unbroken. As such a shoot grows it displaces P 



