SYLVICULTURAL NOTES ON SILVER FIR. 283 



g. Sylviculture^ Systems. 



It is generally grown as coppice, as underwood under 

 standards, soil-protection wood under Oak, also suitable 



for hedges. 



\ 

 h. Formation of Woods. 



From seed or by layers. 



The fruits ripen in September, and fall from October 

 onwards ; they retain their germinating power for about 

 six months. The nuts must be well covered with earth 

 and protected against mice. 



i. Tending. 



The young plants must be protected against cattle and 

 deer. 



Hazel is not often seriously injured by insects. The 

 caterpillars of some Bombyces and Geometrce thin the 

 leaves occasionally. The species of Balaninus at times 

 greatly reduce the crop of nuts. 



The branches show cancerous places, which may be 

 due to Nectria ditissima. 



14. SILVER FLR=T AUes pectinata (D.C.). 

 a. Utility. 



The timber is light, specific gravity of air-dried wood 

 on an average = -48 ; soft, easily worked and splits well ; 

 lasts well in dry localities, less so if exposed to weather. 

 Timber of quickly grown trees is less durable than that 

 of slow grown trees such as are produced in crowded 



