LIFE HISTORIES OF FAMILIAR PLANTS 



have entirely sacrificed their stamens and ovaries 

 in the development of their large corollas. 



Thus we find an advertising device which has 

 proved successful in one family imitated in several 

 others ; but the various families all agree in one 

 point, viz., that they have small and insignificant 

 flowers which offer hone}^ in return for insect-fer- 

 tilisation — hence the advertisement. 



192 



