THE LEAF AS A BUILDER. 



from tlie twig in alternate order witli its neighbors, 

 or did it grow opposite a neighbor ? Fig. B shows 



how leaves grow alternate- 

 ly ; but Fig. C also shows 

 how alternately growing 

 leaves sometimes double up, 

 and, growing 

 thus in pairs, 

 appear to be 

 opposite. But 



it is the main IranoMet to 

 which the term " opposite " 

 applies, and Fig. D illustrates 

 the way opposite leaves seem 

 to spring out from either side 

 of the branchlet. 



The next simple form of a 

 leaf is one which is divided or " cut into," but is 



Fig. a.— Catalpa Leaf. 



