MUTATION 381 



Common Yew, from whence it arose, in its darker foliage and 

 cypress-like habit. Detailed studies of mutations were first 

 made by De Vries on a species of Evening Primrose (GEnothera 

 lamarckiana) , which occurred as an escape in a field near Amster- 

 dam, where it was found producing a considerable number of 



FIG. 222. A new form or mutant which arose from a pure strain of 

 Duke of Albany Pea and which differs in the narrow lanceolate sti- 

 pules. The type on the right, the mutant on the left. [By per- 

 mission of Prof. Bateson, F.R.S., and Miss Pellehew.] 



new forms, which subsequently bred true. For instance, one 

 form was distinguished by the possession of broad leaves, another 

 by red- veined leaves, others by dwarf- or giant-habit, and 

 so on, as the following epitome of some of De Vries' cultures 

 shows. 



