60 FARM FORESTRY 



The following mixtures, taken from Bulletin 153 of the 

 U. S. Department of Agriculture, should prove successful on 

 soils adapted to both species : 



1. Cottonwood and silver maple. 



2. Cottonwood and Norway spruce. 



3. Cottonwood and white spruce. 



4. Cottonwood and green ash. 



5. European larch and red oak. 



6. European larch and white pine. 



7. European larch and white spruce. 



8. European larch and Norway spruce. 



9. White pine and Scotch pine. 



10. White pine and Norway pine. 



11. White pine and hard maple. 



12. White pine and red oak. 



13. Black walnut and white spruce. 



14. Old open stands of black walnut underplanted with 

 white pine and of soft maple with \vhite spruce. 



Many Trees can be Widely Planted. With the exception 

 of the Prairie region with its scanty rainfall and the northern 

 portions of the Lake States and the Spruce region of New 

 England with their severe winters, the climate throughout the 

 northern and eastern portions of the country does not differ 

 materially. Over the whole area there is sufficient rainfall to 

 support tree growth, and the growing season is long enough 

 to mature many species. Many of the species found growing 

 in the southern New England and Middle Atlantic states will 

 also be found growing in the Central Hardwood Region. 

 Because of these facts most of the trees found growing 



fj O 



naturally in one region will also be found on sites suited to 

 them in other regions or will have been widely scattered by 

 planting. There are but few trees that will do well only in 

 restricted regions in this part of the country. Catalpa is an 

 example of this. It grows naturally along the bottomlands 

 of the lower Ohio and Mississippi Rivers and is badly dam- 



