BOOKS AND CURRENT LITERATURE 263 



occurring in tlie potato halves stored in hydrogen. In a hydrogen 

 medium there was practically no increase in reducing sugars. Retar- 

 dation of respiration by subjecting the potatoes to low temperature 

 (4.5°C) and an atmosphere of hydrogen was followed by an increase in 

 reducing sugars and later by a large increase in cane sugar, thus explain- 

 ing low concentration of reducing sugars at high temperatures as due 

 to greater respiratory activity. Potatoes stored at 30°C. for five days 

 at less than an atmosphere (4 mm.) of air behaved like those stored in 

 hydrogen by exhibiting increased concentration of cane sugar and but 

 sHght increase in reducing sugars. From these experiments and others 

 carried out at the time it appears that the .energy used in synthesis of 

 cane sugar may be derived from the respiratory process, either aerobic 

 or anaerobic. — J. G. Brown. 



