398 Field, Forest, and Wayside Flowers 



food within the plant-tissues safely locked up 

 throughout the winter. 



And thus the minute pieces of callus in the inner 

 bark help to preserve the beauty of the forests. 



I have not been able to find any recorded case 

 of the reopening of a little sieve which has once 

 been closed and sealed. 



It seems probable that the very first growth of 

 spring buds is fed, as is the unseasonable growth 

 of too forth-putting autumn ones, by the nourish- 

 ment drawn from closely neighboring cells. By 

 time the unfolding blossoms and leaves of March or 

 April have exhausted this slender store the cam- 

 bium, which is formed each spring, has come into 

 being and has taken up its work. New sieve-cells 

 have been formed just inside the old ones which 

 were sealed up last autumn, and there is a newly 

 organized bark-route from end to end of every 

 trunk and bough. So nourishment travels on 

 unchecked to the expanding buds, and when the 

 trees are fully aroused by April sunshine, they all 

 at once begin to leaf out and to blossom, as the 

 awakened servants, in the palace of the Sleeping 

 Beauty, took up each his task again. 



When next spring's new bark is formed, last 

 spring's sieve-cells will be pushed a very little way 



