Bui. 479, U. S. Dept. of Agriculture. 



Plate XI. 



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A 



: 



55| c 

 -CO 



id 



N 



r^ i 

 ■ ] 



2-1 Douglas Fir, Boulder Nursery. 

 Compare root development with that of same age (3-0) seedling stock (Plate XII). 



