PRACTICAL POKESTKY. 5 



gard the future yield altogether, and in consequence the forest loses 

 its capital value, or may even be totally destroyed. Well-managed 

 forests, on the other hand, are made to yield their service always with- 

 out endangering the future yield, and usually to its great advantage. 

 Like the plant of a successful manufacturer, a forest should increase 

 in productiveness and value year by year. 



Fig. 2.— Scene in the Sihlwald, the town forest of Zurich, Switzerland, from which its owner desires the 



greatest net money return. 



Under various circumstances, then, a forest may yield its best 

 return in protection, in wood, grass, or other forest products, in 

 money, or in interest on the capital it represents. But whichever of 

 these ways of using the forest may be chosen in any given case, the 

 fundamental idea in forestry is that of perpetuation by wise use — that 

 is, of making the forest yield the best service possible at the present 

 in such a way that its usefulness in the future will not be diminished, 

 but rather increased. 



358 



