ON PAPER-SHELL WALNUTS 



others that grow only six or eight inches. One 

 grew five hundred times as fast as another, the 

 nuts from which they grew having been picked 

 from the same tree, and planted the same day side 

 by side. 



To make sure of securing trees having the traits 

 of the original Royal, it is necessary to grow the 

 trees from grafts either of the first generation 

 hybrid or a selected second generation hybrid 

 showing rapid growth. The number of the latter, 

 however, is sufficient to ensure a reasonable pro- 

 portion of good trees from any lot of seed; and 

 the Royal has been in general demand as a tree to 

 furnish stocks on which the Persian walnut may 

 be grafted. 



It is found that on most soils a Persian walnut 

 grafted on roots of the Royal hybrid will produce 

 several times as large a crop as if on its own roots. 

 Moreover the trees under these conditions are 

 relatively free from the blight. 



The nuts of the Royal hybrid are similar to 

 those of the parents, except that they are larger in 

 size. The very thick shell is objectionable, as 

 already noted. Doubtless the shell can be made 

 thinner by selective breeding, but no comprehen- 

 sive efforts in this direction have as yet been car- 

 ried out. The black walnut, in spite of the really 

 fine quality of its nut, has never become an impor- 



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