GROWTH IN HEIGHT. 



DO 



tree which excels in it, but also the chance to spread 

 laterally, and so to complete the defeat of its slower 

 rivals by overtopping them. 





Fig. 52. Fig. 53. 



A tall clear trunk made by natural pruning, and the base of the same tree. 

 Sitka Spruce in the Olympic Forest Reserve, Washington. 



