JONES SOFT ROT OF CARROT, ETC. : CAUSE 



233 



^^ 





Fig. 174. — Cross-section of a McCormick potato tuber taken 12 days after 

 inoculation, i.e., when the rot had subsided, showing (at X-X) the formation of an 

 inhibiting layer of cork under the rotted area. This tuber was streaked with 

 Bacillus carotovorus at the same time as Fig. 168, and rotted as well at the begin- 

 ning. The rotted part (at top) is full of starch grains. From the sound part 

 (below) the starch has been removed to form the cork-layer. C.)mpare with Fig. 

 136. 



Fig. 175. — Cross-section of a potato stem inoculated with Bacillus carotovorus 

 for comparison with Bacillus phi/tophthorus. Section far above the point inocu- 

 lated. Vessel full of bacteria. 



