20 FAEMEKS' BULLETIN 778. 



and which is to be held in storage, may be rendered immune by treat- 

 ing it with two coats of boiled linseed oil applied hot, or it may be 

 immersed in vats of hot oil. The boiled oil will dry more rapidly 

 than the raw linseed oil, especially if kerosene is added to the hot 

 oil. The wood should be treated between October and the 1st of 

 March. 



Linseed oil has an advantage over other substances in that it can 

 also be profitably applied to unseasoned timber, since it will prevent 

 checking in seasoning. This oil stains the wood slightly yellow. In 

 case of wagon stock, however, it can be used without prejudice to 

 the trade and is an effective preventive. 



Creosotes can be effectively used in case of stock to which the 

 brown stain will not be detrimental. The wood should be dipped in 

 vats of hot creosote, or the preservative should be applied hot with 

 a brush. 



In case of finished products or more valuable material, any sub- 

 stance which closes the pores of the wood may be effectively applied. 

 For example, paraffin wax, varnish, etc., effectively close the pores 

 of the wood and prevent the beetles from depositing the eggs, which 

 are laid in these pores. Thus the sap wood portions of backs and 

 interior surfaces of cabinet work, inside finish, and furniture, etc., 

 should also be treated to prevent attack. 



In conclusion it may he stated that while there are a numher of 

 ejfective chemical treatments to prevent attack, and to kill the insects 

 after they get into the loood, the great objection to all of them is the 

 great and recurring expense of treating material that never ivoald 

 le attacked if, by the proper methods of management, the premises 

 were kept free from the pest. 



o 



