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 
