iv ON PLANT LIFE 125 



anthers? Why is the corolla white, while 

 the rest of the plant is green ? 



The honey of course serves to attract the 

 Humble Bees by which the flower is fertilised, 

 and to which it is especially adapted ; the 



CO 



Fig. 7. Fig. 8. 



white colour makes the flower more conspicu- 

 ous ; the lower lip forms the stage on which 

 the Bees may alight; the length of the tube 

 is adapted to that of their proboscis ; its 

 narrowness and the fringe of fine hairs exclude 

 small insects which might rob the flower of 

 its honey without performing any service in 

 return ; the arched upper lip protects the 

 stamens and pistil, and prevents rain-drops 

 from choking up the tube and washing away 

 the honey ; the little teeth are,, I believe, of 



