302 DETERMINATION AND REGULATION OF THE YIELD. 



estimated according to past local experience with due con- 

 sideration of the condition of the several woods. Where the 

 necessary local data are not availa])le, the most suitable 

 average data obtained elsewhere must be used. 



The question, whether the regulation of the yield should 

 refer to the final cuttings only, or include the intermediate 

 cuttings, has been much discussed. There can be no doubt, 

 that the systematic working of a forest should, in the hrst 

 place, be regulated by the final cuttings. At the same time 

 the intermediate yields may be utilised to equalise any 

 unavoidable inequalities of the final yield. Under any 

 circumstances, l)oth classes of yields must be estimated, so as 

 to ascertain the probable quantities of produce, which will be 

 placed upon the market, and to prepare the annual budgets. 



iL Sqia ratio II of Yield info Classes of J 'nut lire. 



The yield should be separated according to classes of 

 produce, as it is brought into the market, say as timber and 

 firewood, or large timber, poles, mining props, fagots, etc., 

 each being given in solid cubic feet. This separation should 

 be based upon locally obtained proportional figures. 



It is also desirable, to give separately the yield of the 

 important species, as for instance oak, other broad leaved 

 species, larch, other conifers, etc. In India, teak, sal, deodar 

 and some other valuable species should always be given 

 separately. 



2. Coppice ]]'u()(h. 



In the first place, the rotation must be determined. By 

 dividing the total area (real or reduced) by the rotation, the 

 size of the annual coupe is obtained. 



Next, the area is divided into as many coupes as the rotation 

 contains years, taking into consideration all matters infiuenchig 

 a proper arrangement of the age gradations, more especially 

 the requirements of transport. 



If a coppice forest is so extensive, that it is desirable to cut 



