BRITISH FOREST TREES 



gained from the free diffusion of sunshine and warmth through- 

 out the foliage ; dominated trees, or those whose crowns are 

 deprived of free access to light and air, bear little or no seed, 

 as also those non-indigenous forest trees, like the sweet 

 chestnut, lime, and English elm, which have never been able 

 to accommodate themselves thoroughly to the climate of 

 Britain as regards reproduction by seed. 



Ney 1 gives the following as' about the usual amount of wingless and 

 clean seed of fair average germinative capacity requisite per acre for the 

 production of a crop of seedlings of average moderate density on soils 

 of average quality : 



1 Die Lehre vom Waldbau, 1885, p. 181 



