LUTHER BURBANK 
lect, were lacking in virility and produced no blos- 
soms. The similar case of the motley hybrids 
made by crossing various members of the rose 
family with their cousin the dewberry will be re- 
called. Also the strange progeny of the straw- 
berry and the raspberry. 
The Chinese-European hybrid quince, then, in 
its dwarfed growth and its sterility merely illus- 
trates the principle of growth that we have pre- 
viously seen manifested with various other plants. 
But the extreme dwarfness of the progeny gives 
an element of added interest. It would be worth 
while, could time be found for it, to make more 
extensive hybridizing tests along the same lines. 
Possibly some other strains of the two species 
than those employed might prove to have slightly 
greater affinity. In that case it is conceivable that 
a new race of quinces might be produced that 
would bear fruit of a new character and give us 
an interesting and perhaps valuable addition to 
the rather small list of orchard fruits. 
In this connection I may refer again to the ex- 
periments in which I hybridized the quince and 
the apple, and to others in which the quince and 
pear were similarly united. The story of these 
experiments has been told in earlier chapters, and 
no detailed account of them need be given here. 
It suffices to repeat that the hybrids in each case 
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