FOREST TREES OF THE PACIFIC SLOPE. 



405 



On account of its medicinal (tonic and laxative) properties the bark is col- 

 lected extensively from trees in its northern range, to the amount, annually, of 

 at least half a million pounds. In Oregon and Washington especially, collect- 

 ing the bark has become an important local industry, to meet the increasing 



Fig. 10li. — Rhatnnua punhAana, northern form. 



demand for bark both in this country and in Europe. Large numbers of trees 

 are destroyed annually by peeling. The cut stumps sprout vigorously, so that, 

 with conservative management the supply can be maintained." 



"An investigation looking to such management is now under way. 



