Metabolism; Digestion and Translocation 265 



pounds. Turpentine 

 oil contains a large 

 per cent of various 

 volatile oils. The 

 common method of 

 turpentine orchard- 

 ing has resulted in a 

 great loss of timber 

 due to the severe in- 

 jury to the tree from 

 the boxing and 

 chipping employed. 

 Methods have been 

 suggested whereby 

 this injury is now re- 

 duced to a minimum 

 (Fig. 67), The 

 crude products ob- 

 tained by the 

 method indicated are 

 distilled, the volatile 

 spirits being con- 

 densed, constituting 

 turpentine, while the 

 nonvolatile products 

 are the solid rosins 

 of commerce. 



153. Digestion. - 

 The seed and the 

 tuber are effective 

 propagative devices, 



FIG. G7. Turpentine orcharding. 

 [After Forest Service.] 



