514 



AUXILIARY FOREST INDUSTRIES. 



thickness of only 1 \ to 2 inches of wood is left below, then the 

 log is raised by levers, and a piece of rope inserted in the 

 opening. On removing the levers, the log returns to its former 

 position, and the cut closes tightly on the rope ; an auger-hole 

 is bored obliquely through the log into this hollow space, and 

 the gutta-percha tube placed in it as before. Tr.] 



Fig. 308. French method of injection. After Boppe. 



Wood to be thus injected should be freshly cut, and still 

 full of sap. Stems therefore are topped, branches cut down 

 to short snags, the bark left uninjured and the injecting 

 process applied as soon as possible. If the base of a log lias 

 dried it should be cut again freshly before being injected. 

 Logs kept in water for a long time preserve the faculty of 

 being injected. 



[The free ends of the logs are tested, either by their colour 



