140 



CORSICA 

 TABLE 20 



Yield Calculations. An example of how the yield is calcu- 

 lated is quoted from the 1907 Marmano plan, where the rela- 

 tionship between the old and average timber is not far from the 

 normal proportion of f to f , namely: 



61,000.89 (old timber) 61 



38,389.72 (average timber) 38' 



62 

 whereas the normal proportion should be 



o / 



"To obtain the annual yield in the pine block during the 

 first period it is (accurate) enough to divide the volume of 

 the old wood, Corsican pine, by J the rotation, or 120. This 



yield is then - - = 508.333 or 508 (17,939 cu. ft.) in 



round figures. 



To this is added a cut of 259 cubic metres (9146 cu. ft.) of 

 maritime pine, making a total cut of 767 cubic metres (27,085 

 cu. ft.) including branches, as against 3000 cubic metres 

 (105,942 cu. ft.) in 1870, excluding branches." 



The details of yield regulation in French selection forests will 

 be discussed in a later volume, entitled American Forest 

 Regulation. 



SALES METHODS AND CONTRACTS TURPENTINE LEASES 



Timber and Wood Sales. The essential features of the 

 methods of selling timber in France will be described in detail 

 in a forthcoming publication. 



The same methods are used in Corsica where all sales of 

 importance are auctioned, even the long-term sales for large 



