On Floivers and Insects. 



lower part, the tube contains honey, and above the 

 honey is a row of hairs almost closing the tube. 

 Now, why has the flower this peculiar form ? What 

 regulates the length of the tube ? What is the use 

 of this arch ? What lessons do these teeth teach 



Fig. 22. Flower of WHITE DEADNETTLE (Lamium album}. 



CO 



Fig. 23. Section of the Flower of the WHITE DEADNETTLK 

 {Lamium album). 



us ? What advantage is the honey to the flower ? 

 Of what use is the fringe of hairs ? Why does the 

 stigma project beyond the anthers ? Why is the 

 corolla white, while the rest of the plant is green ? 

 2. Similar questions may of course be asked with 



I 



