130 . THE BEAUTIES OF NATURE CHAP, ° 
has been more careful. When the Bee alights 
it clasps the “wings” of the flower with its 
legs, thus pressmg them down; they are, | 
however, locked into the “ keel,’ or lower 
petal, which accordingly is also forced down, 
thus exposing the pollen which rubs against, 
and part of which sticks to, the breast of the 
Bee. When she leaves the flower the keel 
and wings rise again, thus protecting the rest 
of the pollen and keeping it ready until 
another visitor comes. It is easy to carry out 
the same process with the fingers. 
PRIMULA 
In the Primrose and Cowslip, again, we find 
quite a different plan. It had long been 
known that if a number of Cowslips or Prim- 
roses are examined, about half would be found 
to have the stigma at the top of the tube and 
the stamens half way down, while in the other 
half the stamens are at the top and the stigma 
half way down. These two forms are about 
equally numerous, but never occur on the 
