SOME PRINCIPLES OF PLANT EVOLUTION 463 



the primary mutants, however, were not new forms. Some of 

 them were the original parent, while others were one or more of 

 the sister species. This suggests that the parent form possesses 

 more characters than it can give expression to in one individual. 

 Some of them are " hidden " or latent, and when some of these 

 latent ones express themselves they do so at the expense of others 

 which in turn become latent or hidden. 



