82 LUTHER BUKBAXK 



origin of muUtion bis full validity, whether or 

 not it be accepted aa tbe aole explanation 



We aball aee tbe truth of ti . 



illustrated in tootcf of caaet io t^" 

 studies. 



The Fi>*Aj- 1 m i 



Meantime for the puri>u!»ci ui proem »iius- 

 tration it is necessar}* to revert to tl"- ' «sr of our 

 fragrant calla. 



After what has just been said it will be obvious 

 that I would explain this mutation as a reversion 

 due to cross-fertilization. 



In other words, some remote ancestors of the 

 calla may have been fragrant, and a chance ming- 

 ling of ancestral germ plasms in the course of the 

 production of tliousands of seedlings of the calla, 

 may have led to such a imion of submerged here- 

 ditary factors as enabled this latent propensity 

 to make itself manifest. 



According to this view, the case i.s comparable 

 to that illustrated by an experiment in which 

 Professors Bateson and Punnett hybridized two 

 white-flowered peas of different strains and pro- 

 duced offspring bearing flowers colored blue and 

 pink and purple. 



The white parent fornix were so neauv lucn il- 

 eal as to be entirely indistinguishable except that 



