ON THE QUINCE 
No bush or tree of the entire lot put forth a 
single blossom. 
OTHER Dwarrs RECALLED 
It is interesting to recall, in connection with 
the curious result of this experiment in hybridiz- 
ing the quinces of widely varying species, the re- 
sults of my hybridization of the California and 
Persian walnuts. 
It will be remembered that the hybrids thus 
produced were of extraordinary growth, but that 
they produced very few nuts, and that among the 
seedlings of the second generation there were 
many trees of dwarfed growth, suggesting the 
quince hybrids. 
We found reason to believe that the curious 
result of hybridizing the walnuts might be ex- 
plained on the supposition that the parent forms 
had diverged almost to the point of mutual antag- 
onism. They had not varied quite to the point 
where their offspring were sterile, but they were 
approaching that limit. 
The quinces of the experiment now under con- 
sideration had diverged one stage farther. They 
are still within the limits of affinity that permit 
cross-fertilization, but not within those that per- 
mit the production of fertile offspring. Their case 
is rather to be likened to that of our petunia and 
tobacco hybrids, which, as the reader will recol- 
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