THE COMPAETMENT SYSTEM. 225 



The limits between the several systems are not alwa3's 

 clearly defined, as will be seen further on, but there are certain 

 general conditions of success which hold good for all. Amongst 

 these the following may be mentioned : — 



(1.) The mother trees must be capable of producing good 



seed in sufficient quantity. 

 (2.) The soil must be in such a condition that it forms a 



good germinating bed. 

 (3.) The young seedlings must have sufficient light to grow 

 up, and yet, if tender, they must be protected against 

 external injurious influences. 

 (4.) The fertility of the locality must be duly preserved by 



protecting the soil against the sun and air currents. 

 These conditions, if not naturally existing, must be produced 

 l)y timely and judicious interference. The measures adopted 

 for the purpose consist in — 



(«.) Cuttings so executed that they produce the desired 



conditions. 

 {J>.) Artificial preparation of the germinating bed, if this 



should he necessary. 

 The several systems comply with these conditions in 

 varying degrees. In order to bring out the general character- 

 istics of the methods, it is desirable to commence with a 

 description of the compartment system. 



1. Tite Comj)artment or Uniform System of Natural 

 Rer/eneration under SJielter-woods. 



The regeneration occurs approximately at the same time 

 and uniformly over a whole wood, which, for convenience' sake, 

 is here called a compartment. The area treated at one time 

 and in a uniform way is called the regeneration area. The 

 new crop should be created, if possible, by one seed year over 

 the whole regeneration area ; this, however, succeeds only in 

 exceptional cases, so that, as a rule, two or even more seed 

 years are required to complete the regeneration. As a 

 consequence the regeneration process may extend over a 



