58 LUTHER BURBANK 



Yet again there may be a union of a thorny 

 factor with a thornless factor; and in this case, 

 as we have seen, thorniness will prevail because, 

 as we say — although, of course, our explanation 

 only states the matter over again in another 

 way — the thorny factor is dominant and the 

 thornless factor recessive in this particular 

 combination. 



Changing our terms to suit the case, the same 

 principles apply to our black and white black- 

 berries. 



And in each case, it will be recalled, the germ 

 cell that bears only dominant factors will breed 

 true to the dominant quality; the germ cell that 

 bears only recessive factors will breed true to 

 the recessive character; and the germ cell that 

 bears the two conflicting factors will have prog- 

 eny in which these factors are separated and 

 reassembled in various combinations, thus 

 accounting for the reappearance of the latent 

 or recessive character. 



Heredity Visualized 



All this is familiar to us and has been illus- 

 trated over and over again from practical cases 

 in the course of our studies. 



And we have agreed that the really mysterious 

 part of the entire process is the fact that the 



