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UNIVERSITY OF CALIFORNIA EXPERIMENT STATION. 



grafted to various varieties of the English walnut and the trees planted 

 out for observation. We may say, however, at the outset, that such 

 trials have resulted without exception in proving the non-desirability 



FIG. 27. Four-year-old Placentia tree on northern California black root. 



of the seedlings of these Paradox trees as a rootstock for the English 

 walnut. Trees on this root are invariably lacking in any unusual vigor 



