309 



SYLYICULTUEAL NOTES OX BEITISH 

 FOREST TREES. 



The theoiy and practice of sylviculture, as described in this 

 work, have been ilhistrated by instances taken from the more 

 important forest trees grown in temperate Europe. For the 

 sake of reference, it will be found useful to bring these scat- 

 tered remarks, and other information, together in a set of 

 notes on each of the trees which are of real sylvicultural 

 importance in Great Britain and Ireland. 



The trees naturally arrange themselves into two groups, 

 the broad leaved and coniferous species. Of each group the 

 important shade bearers have been placed first, as the notes 

 on the light demanders depended on those referring to the 

 former. Generally, the notes have been made as short as 

 possible ; if a full account of each tree had been given, this 

 part would have attained the size of a book. Apart from the 

 author's own experience, they have been derived from the best 

 authorities. 



The following explanations will be useful : — 



(1.) The average specific gravity of air dried wood has 

 been taken from Hess's " Die Eigenschaften und das 

 forstliche Yerhalten der wichtigeren in Deutschland 

 vorkommenden Holzarten.'' 



(•2.) By volume increment is here understood the mean 

 annual production per acre in crowded woods calcu- 

 lated from the increment of the most favourable 

 rotation. 



(3.) The information about insects refers principal!}- to 

 Britain. 



