VI 
WINTER 
J 95 
just at the right moment. If it were not for 
the visits of insects some plants would never 
have seed at all. 
There is a still more complicated class of 
plants which have imperfect flowers, some 
COLUMBINES 
having pistils only, and others only stamens. 
In some cases both kinds of flowers grow on 
one plant, so that the insect has not far to go ; 
but others have one kind of flower only, the 
other being on separate plant, so that an insect 
might have to carry the pollen quite a long 
way. As insects are so necessary to many 
