554 



Journal of Agricultural Research 



Vol. V. No. 13 



Table IV. — Changes in the composition of sweet potatoes at 5° C. — Continued 



SECOND EXPERIMENT (SECOND PERIOD) 



third experiment (second period) 



131a 

 131b 

 133a 

 nz^ 

 134a 

 134b 

 137a 

 137b 

 138a 

 138b 



139a 

 139b 



4-67 



7-34 

 4-36 

 6.26 

 4. 26 

 6.38 

 4. 60 

 6. 50 

 4.91 

 7.40 

 5-61 

 7.21 



-43 

 •59 

 .69 



•54 

 •59 

 •30 



In the third experiment at 5°, which was carried out with potatoes 

 that had been left in the ground for some time after the vines had been 

 destroyed, the conversion of starch took place during both periods as in 

 the other two experiments, but in contrast with these the accumulation 

 of cane sugar took place not only in the second but also in the first period. 

 At the same time there was a slight increase in reducing sugar during 

 the first period and scarcely any further increase during the second. A 



