Modiftcalion of Germinal Constitution of Organisms 175 



Fig. 63. — Oenothera gigas, a mutant of Oenothera Lannirckiana. This form 

 arose but once in DeVries' cultures (in 1895), out of a culture of 14,000 seedlings. 

 From it has arisen a strong race now cultivated in many gardens in Europe and 

 America. 



