Bui. 473, U. S. Dept. of Agriculture. 



Plate XII. 



A 



10 



to 



r ] 



O 



- 



- 



n 



CD 



- 1 - 



: J 



3-0 Douglas Fir, Boulder Nursery. 

 Compare root development with that of same aged (2-1) transplant stock (Plate XI). 



