BARBERRY MANNERS 22Q 
the same cluster (C). Entering it as before, the 
notched edge of the stigmatic rim comes in con- 
tact with the pollen on his tongue and face, and 
the flower is thus fertilized by pollen from an- 
other barberry blossom, the intention of the flow- 
er now perfectly realized in m?^-fertilization. 
The seeds from cross- fertilized flowers are al- 
most invariably more vigorous, and thus yield 
more vigorous plants, than those of flowers fertil- 
ized with their own pollen, and this is why most 
flowers have necessarily developed some means 
by which cross-fertilization can be secured. And 
this has been done through evolution working on 
the lines of natural selection, those seedlings 
which had originally happened, by a variation in 
the flower, to be thus favored by some chance 
peculiarity which insured cross -fertilization, win- 
ning in the struggle with the previous weaker in- 
dividuals, and finally supplanting them altogether. 
