RESPIRATION IN PLANTS 
correlation between oxidase activity and the rate of respiration in 
these organs. The author does not disclaim any role of the demon- 
strable oxidases in respiration, but they certainly are not the controlling 
factor in regulating the rate of respiration in potato tubers. 
2. Catalase activity in the potato juice shows a very striking corre- 
lation with respiratory activity in the tubers. 
Laboratory of Plant Physiology, 
Maryland Agricultural Experiment Station 
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