-334 DETERMINATION OF THE YIELD. 



instance too large a proportion of old or defective woods exist, 

 and in others the cuttings should be below the normal area, if 

 for instance the area of mature woods is deficient. Hence the 

 regulator should give merely the maximum and minimum area 

 to be dealt with. In the above case the area might be given 

 as 150 to 250 acres. 



As long as the total area as determined above under (1) to 

 (3) falls between these limits, it may be accepted as the area 

 to be dealt with during the first ten years. If it is larger than 

 the maximum, then some of the most suitable areas enumerated 

 under (3) should be held over until the next period ; if smaller 

 than the minimum, then possibly some* further woods may be 

 found which could be added to those already placed under (3). 

 In extreme cases the yield may be kept for a number of years 

 below the proper minimum. 



c. The Intermediate Yields. 



The[limit between final and intermediate yields is not always 

 very 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. 



(I)} 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 over is done during the working plan period 

 or later on. 



2. Intermediate yields comprise all other returns derived 

 from 



(a) Cleanings. 



(b) 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 first period. 



