﻿A PPLEMA N — RES T PERIOD 



289 



Rehobeth potatoes grown in the greenhouse and harvested on 

 January 21 furnished the material for this experiment. The tubers 

 were stored in a dry, warm laboratory drawer. 



TABLE XXII 











lol °' 





March 3 





8^08 



Removal of the skin from mature tubers more than doubles the 

 rate of respiration; it falls again with the formation of a new thor- 

 oughly corked skin to that of unpared tubers (table XXIII). 



TABLE XXIII 



McCallum (17a) found ethyl bromide especially effective in 

 forcing the resting buds of potatoes into growth. The writer 

 studied the effect of this treatment on respiration in the tuber and 

 found that it has about the same accelerating effect as removing 

 the skin (table XXIV). 



It has been shown that the rest period can be shortened by 

 wrapping the new tuber in cotton saturated with hydrogen peroxide. 

 This treatment also accelerates the rate of respiration in new tubers 

 (table XXV). 



It is obvious that the elimination or abbreviation of the rest 

 period under the conditions employed in this work is correlated with 



