PART II 



Studies of Leaves and Foliage 



XV. WHAT IS A LEAF? 



81. Is there one leaf, or three, in the picture 

 of the dewberry (or blackberry) Fig. 71? We 

 have already found that branches 

 persist ; that is, they do not 

 fall upon the approach of win- 

 ter. Leaves commonly die and 

 fall. Here, therefore, is a means 

 of answering the question. Does 

 each of the three parts fall away 

 in the autumn and leave the 

 common stalk, a, upon the vine, 

 as a branch? Or 

 does the entire struc- 

 ture fall? 



82. Buds are formed 

 in the axils of leaves, 

 as a rule. Where 

 are the axillary buds 



(78) 



Dewberry. 



