BEES AS BUILDERS OF FLOWERS 



the flowers and the guests. Contemporaneously the upper 

 petals were modified into a helmet, or galea, to protect the 

 anthers and the interior of the flower from wet — and a flower 



Fig. 30. Heal-All. Prunella vulgaris 



A violet-colored bee-flower belonging to the mint family 



like the snapdragon is evolved. In no two cases were the 

 conditions exactly alike, with the result that a great variety 

 of forms has been produced, each of which has its special ex- 



63 



