234 COLLEGE BOTANY 



hours at 100 degrees C. Weigh again. Germinate the other lot, and 

 after the plumules are well started, dry for same length of time as the 

 first lot. Which lot has lost the greatest per cent, of its original 

 weight ? Why ? 



Exercise 5. Select half a dozen potatoes in which the sprouts have just 

 started. Divide into two lots and put in a plate under a bell jar con- 

 taining some moistened blotting paper. Put one lot in a well-lighted 

 place, the other lot in a dark place for a few weeks and then com- 

 pare them. 



