108 



On the LLmgevity of Trees 



searches concerning young trees, because on operating on the 

 oldest trees of each species which cau be obtahied, we possess 

 the advantage of judging of trees at all the stages of their 

 growth. As it would be inconvenient to publish an engraving 

 of these slips, which are sometimes several feet long-, 1 give aa 

 idea of these results by means of the following table : — 



TABLE of the Periods of Increase in Diameter of some Exoge- 

 nous Trees, exfjressed in li7iLS. 



