122 PRACTICAL FORESTRY. 



period as 40 years ; perhaps so ; if this is the case, 

 the money calculation we have made will not be much 

 affected, as what is lost on the one hand will be gained 

 on the other. 



We shall content ourselves with this one example, 

 as if we quadrupled it there would still be room for 

 further. Each must adapt the calculation to his own 

 locality and soil ; ab uno disce omnes. 



To the above calculations must be added the losses 

 and failures of the first few years, from deaths and 

 imperfect development of many trees, the fluctuations 

 of the markets, the cost of re-planting, and so forth. 

 These risks attach, however, to all things mundane, 

 and are by no means peculiar to forestry. 



