INCREMENT ON INVESTED CAPITAL 455 



taken. It may be that only a thinning is necessary, or a 

 partial clearance, in which case the increment of the crop 

 which is left may be greatly stimulated, and may show a 

 very high rate of interest on the capital upon which it is 

 being earned. On the other hand, it may be that a total 

 clearance will have to be effected. 



A particular practice may be correct though actuarial 

 data have not been considered ; but, that is no proof that 

 they are unnecessary. 



Indeed, they alone will often afford the chief, if not the 

 only, evidence that a particular practice is wrong. 



