284 
Journal of Agricultural Research 
V61. XIV, No. 7 
CONCLUSIONS 
Under gas pressure of 5 atmospheres or more sweet potatoes are 
killed. In the killed tissues starch hydrolysis is greatly depressed or 
inhibited. Cane sugar is converted by hydrolysis into reducing sugars 
which accumulate. 
Starch hydrolysis and cane sugar formation in the sweet potato pro¬ 
ceed in the absence of oxygen in the same manner as in air or in an 
atmosphere of oxygen. The presence of oxygen is therefore not always 
a necessary condition for the formation of cane sugar in plant organs. 
The quantity of material consumed in a given period of time in 
anaerobic respiration by the sweet potato is greater than the quantity 
consumed in normal respiration at the same temperature. The actual 
carbon-dioxid output is also greater under anaerobic conditions. Cane 
sugar appears not to be consumed in either process. 
