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] 
