14 WINTER BUDS [CH. 



owing to certain changes which ensue in the texture of 

 the more external of the young leaves composing the 



Fig. 5. Opening of the bud of the Lilac. That to the left shows the 

 loosening of the bud-scales preparatory to expansion ; then, the same in 

 section, slightly magnified. That to the right shows the bud-scales re- 

 flexed and the leafy shoot elongating (Wo). 



buds when the latter are fi-rst formed in the autumn, 

 ready for the winter rest. These outermost leaves, or parts 



Fig. 6. Opening of the bud of the Ash. From left to right, the 

 resting bud, then the bud-scales loosening, next the tips of the leaves 

 protruding, and, lastly, the same in vertical section. The scars of the 

 leaves between which the bud developed are seen at the base (Wo). 



of leaves, become hard, tough, and scale-like, and thus 

 better adapted to protect the delicate parts inside from 



