STRUGGLE FOB EXISTENCE IN A TREE TOP 



15 



trees which he may meet. The horse chestnut will be found 

 interesting. 



IV. THE STRUGGLE FOR EXISTENCE IN A 

 TREE TOP 



16. We have seen, in all the foregoing exam- 

 ples, that every twig bears more buds than can 

 hope to find a chance to grow. Fig. 12 is an 



Fig. 12. 

 The suppression of interior buds. 



oak branch. It is seen that all the leavefe are 

 borne upon the very tips of the branches. That 

 is, the interior of the space is poorly supplied with 

 foliage. If the leaves are all borne at the ends 



