THE WHITE PINE REGION 



If 



315 



By permission of Ihe U, S. Forest Senjt'ce. 

 Fig. 114. — The gray birch has been removed, freeing the pine. This cleaning yielded 

 an immediate profit. See Fig. 113. 



chances are that there is already scattered hemlock reproduction 

 in the stand before cutting. This develops when released by 

 the cutting, and keeps hemlock in the mixture although no seed 

 trees are left. It will be very hard to completely eradicate the 

 hemlock, but it can be kept in a subordinate position. The 

 young hemlock will usually be outstripped by the pine and hard- 

 woods in height growth, and finally take the place of a tolerant 

 understory. As such it serves a good function in promoting 

 natural pruning of the other trees. Windfirm trees of either 

 white pine, oak, ash, or cherry should be selected for seed trees, 

 and, if possible, the cutting should be made at the time of a pine 

 seed year. The chestnut will maintain its representation in 

 the stand by coppicing and through occasional seedlings wliich 

 get a start in some opening, so that it will be unnecessary to 

 leave seed trees of this species. A rotation of approximately 

 eighty years should be used, as the hardwood species need a 



