THE ROYAL WALNUT 77 



As to form of leaf and fruit the hybrid may 

 resemble one parent in one direction and the 

 other parent in another. The leaf of the Paradox 

 walnut, for instance, more closely resembles the 

 leaf of the English parent. The outside appear- 

 ance of the Paradox nut is also similar to that of 

 the English walnut. But on breaking the shell 

 we find that it is thick and strong like the shell 

 of the American species, and the kernel is rela- 

 tively small, quite different in form as well as in 

 flavor from that of the English walnut. 



It cannot be said that anj^one has a very clear 



notion as to precisely what the changes are that 



give to a hybrid race this enhanced vitality. But 



this mystery is after all only part of the great 



all-pervading mystery of heredity, which in turn 



is merged with the mysteries of life processes in 



general. 



Why Some Are Dwarfs 



What I shall consider a little more at length 

 here, however, is the conduct of the seedlings 

 of the second generation grown from either the 

 Royal or the Paradox hybrids. 



How does heredity explain the observed fact 

 that some of these are dwarfs that can by no 

 process of urging be made to attain anji:hing 

 like the average stature of walnuts in general, 

 whereas others, sprung from nuts grown on the 



