THE PIIINCIPLE OF COHESION. Gl 



lioney-disk at the base of the style ; in Z), the style-arms have 

 spread after protrusion through the separated connectives. 

 The brush-like tuft of hairs has swept the pollen out by 

 means of the piston-action of the style. 



In Campanula, the action is different, for the anthers 

 though connivent, have not yet become syngenesious, as in 

 allied genera, e.g. Lobelia. They at first closely surround 

 the style, which is provided with long collecting hairs upon 

 which the pollen is caught. The anthers then shrivel and 

 fall down. Subsequently a bee enters the expanded bell, 

 grasps the style with her legs, and so transfers the pollen to 

 the abdomen. This method is identical with that followed 

 by bees in getting honey from Crocus, though in this 

 genus the anthers remain erect, and, being extrorse, at once 

 discharge the pollen upon the insect without the interven- 

 tion of the style. 



