MODIFICATIONS OF THE METHOD 



33 



The two cuttings must occur close enough together in point 

 of time so that the resiiltant stand is evenaged. From one to 

 20 years under ordinary circimistances represents the possible 

 range of interval between the two cuttings. Three to 10 years 

 may be considered the average interval. 



Fig. s. 



Illustrates the arrangement of the strips in a stand to be reproduced by clear- 

 cutting in alternate strips. 



Fig. 6. 



The same stand as shown in Fig. $; but ten years after the clearcutting of 

 the strips marked A and five years after the clearcutting and reproduction by 

 planting of the strips marked B. While there are now differences in height 

 and age between the reproduction on the two sets of strips yet these differences 

 are too small to cause the stand as a whole to lose its evenaged form. The 

 difference in height will decrease as the stand grows older. 



Reproduction may be secured either artificially or naturally. 

 In general clearcutting the whole stand is used when arti- 

 ficial reproduction is to be employed. This is because the 

 need for providing and distributing an adequate supply of 



