THE EVOLUTION OF LIVING BEINGS. 



129 



The first photograph shows at the top, indicated as P 1 

 and P 2 , the two parents crossed. 



P 1 is the flower of Antirrhinum glutinosum, which is 

 white, except that it has pink striae on the upperlip. 



The flower indicated by P 2 , is the dark red flower of An- 

 tirrhinum majus with which the former was crossed. Of 

 the two other flowers on this photograph, the one which 

 appeared in the fourth selfed generation (F 4 ), was pure 

 ivory and characterized by the possession of spur-like 



