Ccmmon, French, and Burbank Marigolds 



The large double Burbank marigolds hafe been developed from 

 the small single flowers through selective breeding. By cross-fer- 

 tilizing different varieties, a tendency to variation is induced, and by 

 preserving for seed purposes only those flowers which vary in 

 the desired direction, any given quality is accentuated, until 

 finally such a metamorphosis as this is brought about. 

 The rapidity of development varies ivilh different 

 plants, but many generations are required 

 to produce such a transformation 

 as that shown in this picture. 



