PAPER SHELL WALNUTS 39 



I have elsewhere cited a tree sixteen years of 

 age, that produced twenty large apple boxes full 

 of the nuts in a season, so extensive a crop that 

 I sold more than $500 worth of nuts from this 

 single tree that year. And the following year 

 I sold nuts from the same tree to a value of 

 $1,050. The nuts were used for seed to produce 

 trees of the same variety. In 1918 the nuts 

 from this tree were counted and before they had 

 quite all fallen from the tree there were 17,160 

 nuts making a little over forty-five bushels as 

 they fell in the husk. 



This extraordinary difference between the two 

 hybrids is doubtless to be explained by the 

 slightly closer affinity between the parents of the 

 Royal. Their relationship chanced to be pre- 

 cisely close enough to introduce the greatest 

 possible vigor and the largest tendency to varia- 

 tion compatible with fertility. The parents of 

 the Paradox, on the other hand, were removed 

 one stage farther from each other, permit- 

 ting the production of offspring of vigorous 

 growth, but bringing them near to the condition 

 of infecundity. They were not absolutely 

 sterile, but their fecundity was of a very low 

 order. 



The seedlings of the Royal hybrid vary in 

 the second generation, as might be expected, 



