LUTHER BURBANK 
not readily mated with others—which will lead 
us, in a later chapter, into the interesting study of 
plant affinities. 
The bees helped us to make a pink daisy 
because, through heredity, the daisies of our first 
planting gave daisy nectar, though their colors 
were white and orange. And in seven out of any 
ten experiments which we might try, we could 
safely entrust the work of pollenation to the bees, 
or birds, or other messengers with whom the 
plants have built up partnerships. 
But in those other three, the most important 
of the ten, perhaps, we should find that the 
pollenation would have to be done by hand. 
If, for example, we desired to effect a combina- 
tion between two flowers, one of which blooms in 
the spring and the other in mid-summer, the 
bees could be of no service. We should have to 
take the pollen of the early blooming flower and 
carefully save it until it could be applied to the 
other. 
If we desired to effect a combination between 
a bird flower and a bee flower, even if in bloom 
at the same time, we should find it necessary to 
attend to the pollenation ourselves. 
If we had it in mind to effect a cross between 
a particularly large, insipid plum and a small, 
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