DHPINITIONS. 29 



(a.) Regeneration Fellings. 

 (p.) Improvement Cuttings, i 



As a matter of principle, the yield of the Regeneration Fellings 

 in high forests is based on cubical contents, that is to say, it is the 

 figure represented by the total estimated out-turn of these cuttings 

 for a whole Period, divided by the number of years in the Period. 



The Improvement Cuttings in high forests generally consist of 

 Weedings and Thinnings. By reason of their very nature and of the 

 object sought in making them, the yield of weedings is too uncertain 

 as well as unimportant to be taken into account. Thinnings, on 

 the other hand, can not be usefully executed unless made in a re- 

 gular manner, and repeated periodically in the same crop at well 

 defined intervals of time determined beforehand. This can only be 

 done by basing the yield on area. Lastly, if, in the same Working 

 Circle, it becomes necessary to make other exploitations than 

 Regeneration and Improvement Cuttings properly so called — e. g., the 

 removal of scattered trees, or topping off of overhanging crowns — these 

 may be included under Improvement Cuttings, only their yield 

 must be expressed in cubical contents, by an area or in number of 

 trees, according to the nature of the cuttings themselves and the 

 produce derived from them. 



In all these cases, the object in view, so far as the distribution 

 of the produce is concerned, ought to be to let the yield or the 

 average annual out-turn vary as little as possible from Period to 

 Period. We now understand the meaning of the phrase ASSUEING 

 A Sustained Yield. 



In the foregoing paragraphs we have defined Forest Organisation 

 bynotmg the essential conditions which all Organisation Projects 

 should fulfil. We have followed this up by defining and explaining 

 in a summary manner the value and bearing of these conditions, 

 while bringing out the intimate connection that exists between 



(]) Eegeneration Fellings— the fellings or series of fellings made in an exploit- 

 able piece of forest such that the stock that is to take the place of the one there* 

 by exploited, shall come up as the direct result of the fellings themselves. 



Improvement Cuttings— 'Cuttings made solely with the object of improving 

 the growth of existing stock that has not yet become exploitable. 



For full explanations of the meaning of these terms see Fbrkandbz and 

 Smythies' "Tbanslaiiok or Baoneris's Manual of Sylviculture" (Translatori) 



