THE GENERAL -WOllKlNG SCHEMS. 137 



But these meagre indications would not be enough to serve us 

 guidanee for the Executive Forest Officer. It is therefore necessary 

 to complete them by prescribing the nature, successjon, g.nd extent 

 of the exploitations to be made throughout the whole Worijing 

 Circle. The portion of the Organisation Project which gives these 

 details, we will designate the Special Schemk of Expi,oitatiqns. 

 It consists of one or more tabular statements, in which are con- 

 signed prescriptions relative to exploitations to be made during 

 a single Period only. 



Thus, whereas the General Working Scheme applies to the 

 whole duration of the Rotation, the succession of the cultural 

 operations, and the annual yield are fixed for one Period only. It 

 follows, therefore, that at the beginning of each Period it is 

 necessary to draw up a fresh Special Scheme of SJxploJtations, 

 that is to say, to arrange in advance the succession of the cuttings 

 and similarly as before the annual yield for that Period. This last 

 operation, in its entiretj', may be termed the Periodic JlEVtsiQlT 

 OF THE OeGANISATION PROJECT. 



Lastl}^, in order to provide against errors in tlie valuation 

 surveys and against the elfects of xinforeseen disasters, it is the 

 rule to verify the quota of the annual yield once or oftener, at 

 fi,sei intervals, during the currency of eaoh Period. 



Having thus far described summarily the Method by Area, 

 we will now proceed to show how to apply it to high forest? that 

 are to be treated according to the Natural Method. 



SECTION II. 



FEAIIIXG OF THE GEXEEAL WOKKING SCHEJVIE. 



The framing of the General Working Scheme for a bigfi 

 forest organised by area consists wholly ^n the division of the 

 Rotation into Periods and the Working Circle into corresponding 

 Blocks. 



As regards the Periods, it is, for the sake of simplicity, taken 

 for granted that they shall be equal Now being equal, what 

 eught their duration to be ? We proceed to answer this questioij. 



It has been. a subject of much vehement discussion, and yet 

 the answer to it seems to us very simple. It is the rule that all 

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