On Flowers and Insects. 



12: 



Fig. 28. COMMON WILLOW HERB (Epilobium angustifoliuni). 



III. 



r . Among other obvious evidences that the beauty 

 of flowers is useful in consequence of its attracting 

 insects, we may adduce those cases in which the 

 transference of the pollen is effected in different 

 manners in nearly allied plants, sometimes even in 

 the same genus. 



Thus, the Common Mallow (fig. 29) and Dwarf 

 Mallow (fig. 30), which grow in the same localities, 

 and therefore must come into competition, are 

 nevertheless nearly equally common. 



In the Common Mallow, however, where the 



