884 JOURNAL OF FORESTRY 



however. The even-aged stand 150 years old mentioned in this paper, 

 if carried to 180 years will give a cut of 48,000 board feet per acre. 

 A yield table for a selection stand in the same locality has been made. 

 In this, the distribution of age classes, the character of reproduction, 

 the accelerated growth of the reserved trees as well as the loss of such 

 trees, has been based upon a study of selection cuttings old enough to 

 indicate what happens. This yield table gives as the sum of three 

 periodic cvits through 180 years 36,000 board feet. 



If the silvicultural and management requirements of a species indi- 

 cate a clear cutting method, then it would seem that clear cutting should 

 be practiced with it generally. It is not good forestry to be committed 

 unalterably to a single method, however. A local forest condition 

 should be managed on its own merits. Where a body of yellow pine is 

 found containing a large proportion of pole age-classes, it woiild cer- 

 tainly be unwise to sacrifice this profitable growing stock by cutting it 

 clear. Likewise on very severe site conditions it may be wise to main- 

 tain a selection forest. 



The question now arises, how will the regeneration of the forest be 

 cared for in clear cutting of yellow pine. In the Northwest the gen- 

 erally abundant advance reproduction in the present virgin forest is the 

 already established second-growth. As an insurance against fire, and 

 to seed up openings where they occur, there should be left four or five 

 seed trees per acre which may be retained through the rotation. In the 

 case of the future even-aged forest, more of an effort will be required 

 to secure reproduction. At 180 years an even-aged stand of yellow 

 pine is still young and still growing in too dense a condition to permit 

 of much advance reproduction getting established under it. To secure 

 reproduction it may be necessary to make first a seeding cut of 30 per 

 cent or more of the stand and to allow time enough for a cover of 

 reproduction to get started, such as is now found in the virgin forest. 

 This may require 20 or 25 years, after which the main cutting of the 

 overwood may take place. 



In conclusion it may be said : 



(1) An even-aged succession forest in western yellow pine is a 

 proven fact. 



(2) This even-aged forest is developing extensively on old private 

 cut-over areas and on the more heavily cut of timber sale areas regard- 

 less of our intention. 



