28 



THE VEGETATIVE FUNCTIONS OF PLANTS 



Fig. i8. — ^Leaf of New Zealand raspberry {Riibus auslralis). 



Fig. ig. — Homology of bud-scales in an ash {Fraxinus Sp.). Series 

 showing gradual transition from outer bud-scale (at left) to unexpanded 

 foliage leaf (at right). The outer bud-scale is morphologically a leaf- 

 base. (Photo by the author.). 



