l62 THE EVOLUTION OF LIVING BEINGS. 



My contention is that they were segregates from im- 

 pure purples, indistinctible from pure purples, which 

 grew intermixed with the pure purples in Sicily, and 

 which revealed their impure nature after isolation in 

 domestication, just as my impure brown-yellow wall- 

 flowers segregate, if isolated and selfed : violets, golden- 

 yellows and whites. 



The real origin of the different types which we unite to a 

 Linn eon lies not inside that Linneon — although part of 

 them arose from secondary intra-linneontic segregation 

 — but lies further back in the cross of two individuals, 

 belonging to different other pre-existing Linneons. 



