134 A MANUAL OF FORESTRY. 



the area, representing an even-aged, or approximately 

 even-aged, wood. Each wood comprises one or more 

 compartments, and either the whole, or one compartment 

 at a time, is regenerated simultaneously, so that the old 

 crop is replaced hy a young even-aged wood. 



(4.) The Strip System. This is a modification of the 

 compartment system, each compartment receiving the 

 shape of a strip. As it differs from the compartment 

 system in some respects, it will be dealt with separately. 



The limits between the several systems are not always 

 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 men- 

 tioned : 



(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 they must, if tender, be pro- 

 tected against external injurious influences. 

 (4.) The fertility of the locality must be duly pre- 

 served by protecting the soil against the sun 

 and air currents. 



These conditions, if not naturally existing, must be 

 produced by timely and judicious interference. The 

 measures adopted for the purpose consist in 



(a.) Cuttings so executed that they produce the 



desired conditions. 

 (b.) Artificial preparation of the germinating bed, if 



this should be necessary. 



