MUTATION 



65 



Amsterdam, where it was possible to maintain them 

 in normal healthy condition, de Vries was able to 

 follow their individual histories with certainty. 



He found that, out of 54,343 plants of the species 

 0. lamarckiana grown during eight years, there ap- 

 peared 837 mutants comprising seven different ele- 

 mentary species, all of which, with the exception of 

 0. scintillans, bred true. See table. 



MUTANTS OF (ENOTHERA LAMARCKIANA 



Some explanatory comment on this table may be 

 of value. 



The seeds in each generation were self-fertilized 

 lamarckiana. 



The mutant gigas occurred once, in 1895. From 

 the seeds of this one plant were produced 450 true 

 gigas offspring in the first year, and the strain con- 

 tinues to breed true. 



Albida was first noted in 1895, but de Vries remem- 



F 



