THE EVOLUTION OF LIVING BEINGS. 



129 



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

 and P^, the two parents crossed. 



P^ is the flower of Antirrhinum glutinosum, which is 

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



The flower indicated by P^, 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 (F4), was pure 

 ivory and characterized by the possession of spur-hke 



