156 A MANUAL OF FORESTRY. 



In mixed woods, groups of different species may 

 require regeneration at different times, offering an 

 additional opportunity for a judicious selection of the 

 groups to be first taken in hand. 



iii. DIFFERENCES IN THE CONDITIONS OF THE LOCALITY. 



These may demand different treatment. The degree 

 of moisture, porosity and fertility may vary from place to 

 place, according to the surface configuration, aspect, and 

 the character of the soil, inviting a change of treatment, 

 and an earlier or later commencement of the regeneration 

 process. 



iv. GENERALLY. 



It is clear that in many woods the most suitable 

 moment for regeneration does not occur at one and the 

 same time over the whole area, thus offering sufficient 

 room for a suitable selection of groups in which the 

 process of regeneration should commence. 



b. Process of Regeneration. 



This is, in principle, the same as that described under 

 the compartment system ; there are preparatory, seeding 

 and final cuttings, but they are not always quite distinct, 

 and frequently the preparatory or seeding cutting, 

 or both, are unnecessary. Over advance growth, for 

 instance, the two first stages are already past, and the 

 final stage alone remains. 



Frequently a seeding cutting or a final clearing in 

 one group admits sufficient light into an adjoining one 

 to act as a preparatory cutting for it. 



