GENERAL NOTIONS. d 



moreover, distribute the annual exploitations of principal produce 

 according to the requirements of the Kules for locating coupes. 



Again, it is very important that the annual outturn should be 



sufficiently equal during the whole rotation. This condition of a 



sustained yield may be realized in high forests worked by the 



Natural Method, by exploiting during equal periods either equal 



quantities of produce or simply equivalent areas ,i.e., areas of equal 



productive power. Here we observe the point of departure for the 



two different methods employed in the drawing up the Working 



Scheme for such forests, which constitute as many different methods 



of Forest Organisation. One of these, comprising several modes of 



procedure, we will call the Volumetric Method, the other we 



will term the Method of Equivalent Areas. We shall examine 



each method separately ; but before proceeding to do so, it is 



necessary to define clearly the practical value of the fundamental 



idea that essentially underlies them both, namely, the realisation of 



a sustained yield. 



