[Vol 10, 1923] 



72 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Explanation of Plate 



PLATE 2 



Fig. 1. External view of tuber selected to illustrate characteristics of the 

 rot as well as extent to which it mav be manifest externally. 



Fig. 2. internal view of same. The necrosed tissues were quite dry and 

 cheesy. 



Pig. 'A. External view of affected tuber. The tuber appears to be quite 

 sound except for slight blackening ami shrinking of the stolen. 



Pig. 4. Internal view of same tuber. Note extent of lesion. 



Fig. 5. Apparatus and materials used for determination of su^ r ar consump 

 tion. 



