IV 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 ee^-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 



