The Living Trunk and Branches 143 



Sometimes the extra or " sub " rings in a trunk 

 can be easily detected, for, though several of them 

 may be made in one single year, the first cells 

 formed in spring will probably be extra large, 

 while the last ones, formed in late summer, will 

 be extra small. 



Fi^. 35. A, The "stock" and "scion" prepared for "approach 

 grafting"; B, "Approach grafting" completed. 



In like manner the wind grafts trees together in the wild woods. 



But sometimes the sub rings are so broad and 

 so even that they might deceive even a Govern- 

 ment forester. 



The age of a tree cannot be exactly told by its 

 rings except in a northern latitude, and in an even 

 climate, where the woods have a time of vigorous 

 growth, followed by a time of undisturbed repose. 



