THE SELECTION SYSTEM 81 



6. All trees certain to he blown down should he 

 marked. 



7. Trees likely to be destroyed or seriously injured 

 in lumbering should be marked. 



8. It is occasionally necessary to leave trees above the 

 limit, if their removal would result in serious windfall. 

 This is particularly true of the hardwoods. 



9. In leaving special trees for seed, spruce and white 

 pine should be favored over all the other species, and 

 hard maple and birch should be favored over hemlock, 

 beech, fir, and soft maple. 



10. A seed-tree should never be left where it will 

 not serve its purpose. Thus, on hardwood land where 

 abundant birch and maple seed-trees stand, there is little 

 use in ieaving for seed a spruce above the diameter limit. 



11. In selecting seed-trees, only such as have a well- 

 developed crown and are now capable of bearing seed 

 should be left. 



12. In choosing between trees for seed, each of which 

 will serve the purpose equally well, the smallest should 

 be chosen. 



13. Do not leave seed-trees — 



a. Which will be blown down. 



b. Which will be broken or destroyed in log- 



ging. 



c. Which are likely to be cut for lumbering pur- 



poses. 



d. Which must be cut to make way for a logging 



road or skidway. 



