CLEAR CUTTING IN HIGH FOREST. 301 



After that, 250 acres might be cut durmg every 10 years, 

 so that, at the end of 30 years in all, the distribution of the 

 age classes would be : — 



After 3U Years 

 Age Class. Acres. 



1-20 = 525K^^2 



21—40 = 487] 



41-60 = 425) ,^gg 



Over 60 = 563 > 



The deviations from the normal distribution still existing will 

 disappear by continuing to cut about 250 acres every 10 years. 



r. The Iiitermediaic Yields. 

 The limit between final and intermediate yields is not 

 always quite clear. In a general way it may be said, that — 



(1.) Final yields comprise — 



(a.) All returns obtained from woods, which are put down 

 for regeneration during the first period. 



(h.) All returns from other woods, which, in consequence of 

 unforeseen causes, are so large, that the regeneration of 

 the woods becomes necessary, whether the final cutting 

 9ver is done during the working plan period or 

 later on. 



(2.) Intermediate i/ields comprise all other returns derived 

 from — 



(a.) Cleanings. 



(h.) Ordinary thinnings. 



(c.) Pruning, cutting of standards, etc. 



{d.) Accidental cuttings, such as dry wood cuttings, wind- 

 falls, etc., in so far as they do not occur in the areas 

 put down for regeneration during the working plan 

 period, or are of such extent that they come under 

 sub-head (1 b.), above. 



The woods to be cleaned and thinned are put down according 

 to their areas. The quantity of intermediate yields is best 



