ON TIMBER TREES 



Thus, as we have seen, one of the parents of 

 the Paradox walnut was a tree not indigenous to 

 America. But we may recall also that another 

 hybrid walnut, the Royal, which sprang from the 

 union of two indigenous species, the black walnut 

 of the Eastern United States and the black walnut 

 of California, rivals the Paradox in its capacity for 

 rapid and gigantic growth. 



So it is obvious that we are by no means 

 reduced to the necessity of making requisition on 

 foreign lands for material with which to develop 

 our new races of quick-growing forest trees. 



But, on the other hand, the plant developer is 

 always willing, like Moliere, to take his own where 

 he finds it. So if foreign species can be found that 

 will hybridize advantageously with our native 

 species, they will of course be welcomed. The 

 reader will recall that I have invoked the aid of 

 numberless exotic fruit trees and vegetables and 

 flower bearers in the course of my experiments in 

 plant development. There is every reason to 

 expect that equal advantage will result from the 

 utilization of forest trees from, let us say, Siberia 

 in one hemisphere and Australia in the other to 

 blend with the strains of American species. 



In some cases it will be possible to bring the 

 foreign species and acclimate them without hybrid- 

 ization. This has been done with several species 



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