STRUGGLE FOR EXISTENCE IN A TREE TOP 



13 



leader, aud the side growths are strong. Let the pupil now figure 

 out how many buds have perished (or at least failed to make 

 permanent branches) in each of these trees, if they are supposed 

 to be seven years old. Any garden cherry tree will give him the 



FIG. 9. 

 Determinate habit of the sour cherry. 



probable numoer of buds to each annual growth. Evsn without 

 the figures, it is evident that there are very many more failures 

 than successes in any tree top. Let him also explain why the 

 branches in Fig. 8 are in tiers. 



