vi] METHODS OF TREATMENT 41 



standing crop which is to be removed within the period, and this 

 annual volume may be extracted from any part of the block under 

 regeneration, whether in the form of seed, secondary or final 

 felling, according to silvicultural requirements. In the rare 

 cases in which annual coupes can be laid out on the ground, the 

 yield would be regulated by area, but the volume of timber 

 becoming available year by year during the period would be 

 easily ascertainable. 



A general working scheme will then be drawn up for the 

 whole rotation, and a tabular statement prepared showing 

 what compartments have been allotted for regeneration to each 

 period; and a special plan will be similarly prepared in tabular 

 form showing the areas to be worked over during the coming 

 period by regeneration fellings regulated by volume, and showing 

 the ages of the crops occupying the compartments that form 

 Block I. A table of the tending operations, cleanings and 

 thinnings, according to cultural requirements, to be carried out 

 over the whole working-circle during this same first period, 

 indicating the periodicity of these operations, and the areas to 

 be worked over each year up to the end of the period will also 

 be prepared. These subsidiary fellings will be regulated by area 

 only, but cultural rules may be issued, calling attention to any 

 special features that may exist. The calculations on which is 

 based the regulation of the annual yield will be discussed in the 

 following chapter. 



If the crop is a mixed one, rules will be issued applying both 

 to the regeneration fellings and to the tending operations, laying 

 down the cultural procedure to be followed in each case, so that 

 the more valuable species may be protected against other com- 

 peting kinds of trees, and favoured at each stage of its develop- 

 ment. A judicious control of the light conditions will enable the 

 forester to create a young crop of the composition desired, and to 

 direct the development of the crop both in quantity and quality. 



39. Clear-felling with natural regeneration. 



Clear-felling, with natural regeneration is an exceptional 

 method of treatment which is only possible under specially 

 favourable circumstances. An instance occurs in the forests of 

 the maritime pine in the sandy region of the Landes, in France. 



