vi] METHODS OF TREATMENT 55 



extreme simplicity : the most important features of the arrange- 

 ment are the adoption of a felling-cycle of the (culturally) correct 

 duration, and the cultural rules controlling the fellings. 



These rules will state what timber is to be removed, and under 

 what circumstances; they will also provide against too great 

 reduction of the leaf-canopy, and of the density of the crops, and 

 against over-exposure of young growth, and of the soil. Some 

 subsidiary cultural operations may also be arranged in a second 

 tabular statement showing the areas to be worked over year by 

 year. 



These minor operations and their periodicity will depend on 

 the cultural requirements of the crop. In any case it will prob- 

 ably be wise to make one in the year following the principal 

 improvement fellings, in which a cleaning will be made over the 

 same area, and unsaleable material of all kinds extracted (all 

 available marketable timber will have been taken out in the 

 principal improvement felling and sold standing or felled), and 

 all young growth of good species, but of bad shape, or damaged 

 in the fellings, cut back. If the area is very large, several 

 felling-series may be made in order to reduce the size of the 

 annual coupe, as the felling-cycle should not usually be longer 

 than twenty years at most. 



