TIIK NUTRITION OF I'LANTS 



167 



scattered also over the inner surface of the blade. These 

 glands excrete a clear, sticky fluid, which hangs to them in 

 drops like dew-drops. If a small insect becomes entangled 



Fig. 157. Plants of I)wn<va^ showing the rosette habit of the leaves with terminal 

 traps, and the erect flowering stem. — After Kerner. 



in the sticky droj), the hair begins to curve inward, and 

 presently j^resses it.s victim down upon the surface of the 

 blade. In the case of larger insects, several of the marginal 

 hairs may join together in holding it, or the whole blade 

 may become more or less rolled inward. 

 12 



