PLATE LXVI 



Fig. I. — ^Young tomato plants six days after inoculation by needle pricks with the 

 nastxirtium organism, Bacterium solanacearum. 



Fig. 2. — Normal nasturtium stem enlarged to show uniform (unstriped) appearance. 



Fig. 3. — A nasturtium stem inoculated with Bacterium solanacearum, showing strip- 

 ing due to bacterial invasion of the bundles. 



