On Flowers and Insects. 



these two kinds of flowers had long been known, but 

 it remained unexplained until Mr. Darwin devoted 

 his attention to the subject. Now that he has fur- 

 nished us with the clue, the case is clear enough. 



5. An insect visiting a plant of the short-styled 

 form would dust its proboscis at a certain distance 

 from the extremity (fig. 54, a), which, when the 

 insect passed to a long-styled flower, would come 



OoOO 

 



x sso ^ 



Fig- S3- Pollen grains. Fig. 54. 



Section of the Flower of Section of the Flower ol 



PRIMULA. PRIMULA. 



Long-styled form. Short-styled form. 



just opposite to the pistil (fig. 53, st\ At the same 

 time, the stamens of this second form (fig. 53, a] 

 would dust the proboscis at a point considerably 

 nearer to the extremity, which in its turn would 

 correspond to the position of the stigma in the first 

 form (fig. 54, sf}. The two kinds of flowers never 

 grow together on the same stock, and the two kinds 

 of plants generally grow together in nearly equal 



