20 



BUD OF SPRUCE 



[CH. 



Thus the Pine-bud is a bud of buds, and not simply a 

 bud enclosing leaves, or leaves and flowers only, as in the 

 former cases. 



Fig. 13. 



Fig. 14. 



Fig. 13. Vertical section through buds of Spruce, Picea excelsa. 

 m pith ; h wood ; b phloem ; r primary cortex ; p bud ; v cavity beneath 

 the bud (Ha). 



Fig. 14. Vertical section of bud of the Spruce, showing the numerous 

 bud-scales a, inserted on a ring of tissue surrounding and investing the 

 apex of the shoot v ; the latter bears the protuberances which will 

 develop into leaves, z pith of shoot-axis; vr cortex of shoot (Sa). 



In the Firs, where the spirally arranged bud-scales are 

 equally numerous, or nearly so, we have the same general 



