THE NUTRITION OF PLANTS 



163 



latter are used by the flowers as agents of pollination. An 

 account of this relationship, with illustrations, was given in 



Fig. 153. An ant plant {Ilydnophytum) from South Java, in which an excrescent 

 growth provides a habitation for ants.— After Schimper. 



Chapter VII, but it should be associated with other illustra- 

 tions of symbiosis. 



