= ON PLANT LIFE 159 
captured by glutinous hairs. Again, the Blad- 
derwort (Utricularia), a plant with pretty 
yellow flowers, growing in pools and slow 
streams, is so called because it bears a great 
number of bladders or utricles, each of which 
is a real miniature eel-trap, having an orifice 
guarded by a flap opening inwards which 
allows small water animals to enter, but pre- 
vents them from coming out again. The 
Butterwort (Pinguicula) is another of these 
carnivorous plants. 
MOVEMENTS OF PLANTS 
While considering Plant life we must by 
no means confine our attention to the higher 
orders, but must remember also those lower 
groups which converge towards the lower 
forms of animals, so that in the present state 
of our knowledge the two cannot always be 
distinguished with certainty. Many of them 
differ indeed greatly from the ordinary con- 
ception of a plant. Even the comparatively 
highly organised Seaweeds multiply by means 
