158 A MANUAL OF FORESTRY. 



in the Buxa Sal forest in Bengal, every 40 years. It 

 stands to reason, that in such cases, the cuttings must 

 be heavier in proportion to the interval between every 

 two cuttings. 



5. Comparative Merits of the four Systems of Natural 

 Regeneration under Shelter- Woods. 



Each of these systems has certain advantages and 

 drawbacks, which it is useful to bring out and compare. 

 The result will be to show that under a given set of 

 conditions any one system may be preferable to the others. 



a. The Compartment System. 



(1.) The business of regeneration is concentrated on an 

 uninterrupted portion of the area, and it is completed 

 within a comparatively short space of time. It follows 

 that supervision is easier, and that it can be more com- 

 plete, all other things being equal, than when the work 

 is spread over a number of disjointed groups or strips. 



(2.) The material to be removed at one time being 

 collected within the smallest space, more satisfactory 

 and cheaper means of export are admissible than under 

 opposite conditions. Roads, slides, and other means of 

 transport are of a minimum length, and their con- 

 struction and annual repairs are less expensive than 

 in the other systems. 



(3.) Lateral shade is less likely to injure a young 

 crop demanding full enjoyment of light. 



(4.) Under the system a whole wood, or compart- 

 ment, is treated in an uniform manner. If the cuttings 

 have been executed at the right time and in the right 



