STEWART'S DISEASE: NON-NUTRITIONAL ENVIRONMENT 169 



Contrast with No. IX. Effect of sunlight? of dry air? of 

 freezing? of weak acids? of weak sodium hydrate? of chloro- 





m 



- 









FIG. 110 Longitudinal section of outer layers at base of a sweet-corn kernel 

 (level of the radicle) showing presence of Aplanobacter stewarti between cell-walls 

 and in the vessels. 



FIG. 111. Aplanobacter stewarti forming a cavity in the periphery of a sweet- 

 corn kernel. Same section and same level as Fig. 110. 



form in bouillon? Maximum toleration of sodium chlorid in 

 bouillon? (Begin with 5 per cent. Contrast with No. I.) 



FOR THE DISEASE. Signs. How soon does the disease ap- 

 pear in the inoculated leaves? How many days between the 



