28 



PRINCIPLES AND PRACTICE OF PRUNING 



32. The tip of the stem and of the branch in flowering 

 plants is the point from which extension takes place. 

 Since any wood bud may become the starting point of a 

 new branch or stem, this statement is general. Dissection 



FIG. 21— SEEDLING APPLE SEEN FROM ABOVE 

 Here the tree shown in Fie. 20 shows how the leaves apparently make an al- 

 most perfect rosette. Thus they cet the fullest advantage of the light. Note 

 the spaces almost opposite each other where it seems as if a leaf were missing. 

 These "jogs" were caused by the nearness of other seedlings in the nursety row; 

 there was not the same chance to get light as in the other directions. 



has shown that extension is dependent upon no one cell, 

 but that a rather indefinite cell area, which constitutes 

 the primary meristem, is the originating tissue. Here 

 division rapidly takes place, while immediately in the rear 

 of the dividing cells is the area of extension. 



