MIXTURES OF LIGHT DEMANDING SPECIES. 87 



Scotch pine remains. Only on good fresh soil does birch 

 last until the Scotch pine has reached a marketable size. 



At the same time birch may be a desirable admixture, 

 where the object is to protect the Scotch pine against insects, 

 snow, fire, etc., and where a more suitable mixture is 

 impracticable. 



(5.) Scotch pine witJi larcJi. — This mixture leads to unsatis- 

 factory results whenever the locality is not thoroughly suited 

 to larch. During youth, up to 15 or 20 years, larch grows 

 quicker and may injure the Scotch pine. If the latter makes 

 its way up and begins to press round the larch, the latter may 

 require help. 



Nevertheless, this mixture occurs over extensive areas in 

 the United Kingdom, not because it is the best that can l)e 

 devised, but because Scotch pine thrives well and yields 

 higher returns than most of the shade bearing species which 

 could be substituted for it. 



Other mixtures, in which the Scotch pine is the principal 

 species, are : — 



Scotch pine with Corsican pine ; a good mixture. 

 ,, ,, ,, Weymouth pine; a good mixture. 



,, ,, ,, Austrian pine; the latter disappears, as 



it is slower growing, unless it is 

 helped. 

 ,, ,, ,, sweet chestnut ; the latter often becomes 



a soil protection wood. 



In England sweet chestnut is sometimes mixed with 

 larch. 



(6.) Alder iritli hircli and aspen. — This mixture occurs in 

 wet localities, where nothing else will grow. 



h. Coppice, and Coppice with Standards. 



Woods of coppice icith standards consisting of light 



demanding species only, are comparatively rare, as the 



standards must either be very few in number, or the 



underwood suffers. Under any circumstances such mixtures 



