THE CROWN GALL: TECHNIC 



443 





FIG. 339. A. Section of crown gall on tobacco due to Bacterium tumefaciens. 

 Teratoma developing on the cut end of an inoculated internode. Tumor below 

 and a dwarfed shoot above developing out of it. 



B. Tissue of leaf from A (at A') showing the palisade tissue reversed, i.e., 

 facing away from the sky. 



