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- 



FlG. 110 — Longitiulinal section of outtT layiTS at hasc ol a swcct-coni kernel 

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

 and in the vessels. 



I 



r 



Fig. 111. — Aplanobacter stvicmii lorming a cavity in ihc |iciii)liery 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 



