ON PAPER-SHELL WALNUTS 



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 another tree to the value of $1,050. The nuts 

 were used for seed to produce trees of the same 

 variety. 



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 precisely close 

 enough to introduce the greatest possible vigor 

 and the largest tendency to variation compatible 

 with fertility. The parents of the Paradox, on the 

 other hand, were removed one stage farther from 

 each other, permitting the production of offspring 

 of vigorous growth, but bringing them near to the 

 condition of infecundity. They were not abso- 

 lutely 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, although 

 the variation in size and foliage is less than in the 

 case of the Paradox. The extraordinary range of 

 size, some of the second generation hybrids being 

 giants and others dwarfs, has been elsewhere re- 

 ferred to. It will be recalled that some of these 

 second generation hybrids grew to the height of 

 four feet in the first year, while beside them were 



[47] 



