Hedgerow Life 
where else, and avoids that particular 
flower in future. 
Some plants, again, have an arrange- 
ment of springy hairs through which the 
insect has to force its way—like a 
lobster-pot or a mouse-trap. The arum 
has such a trap; and the flies which 
force their way in are unable to get out 
again, but are kept imprisoned in a 
hollow chamber until the pollen ripens 
and falls on their backs and dusts them 
with the life-giving powder. Then, but 
not before, the hairs through which they 
have entered, and which have _ barred 
their way out, wither away, and out they 
all fly, ready to take the pollen to other 
arums. Other flowers, like those of the 
broom, on being touched by a bee, spring 
open suddenly and dust the insect with 
the pollen-powder. 
It 
