I02 THE EVOLUTION OF LIVING BEINGS. 



In plants this succeeds, as we saw from the example 

 of the wallflowers, easily. 



Suppose a savage takes home for adornment of his 

 garden, a wild brown wallflower. Planted, this indivi- 

 dual, if heterozygous, will, from the seeds it scathers 

 around it, raise an offspring among which there wiUbe 

 some with white flowers. 



Now suppose the savage prefers this white-flowered 

 race above the brown-flowered one, and consequently 

 pulls out all brown-flowered plants which sprang up in 

 his garden, he succeeds at once in obtaining this white 

 flowered form — which happens to be the recessive — 

 pure, and has thus, with very little trouble or insight, 

 obtained a new constant race. 



In the same way, it is easy to obtain new races of rab- 

 bits. Suppose a heterozygous pregnant wild rabbit has 

 been caught by a savage and put into a cage, and let us 

 suppose further — taking the most unfavorable exam- 

 ple — that this heterozygote was pregnant from a 

 pure grey male. 



The litter thrown, wiU then consist of pure greys 

 only, but as some of the males in this litter will be 

 heterozygotes, such a heterozygous male will, paired 

 with its mother or with a heterozygous sister, give 

 some aberrant offspring by segregation, which aber- 

 rant forms, if bred together, will give easily rise to 

 new races. 



Isolation and subsequent selection of the aberrant 

 types consequently suffises to obtain the aberrant forms 

 cryptomerously hidden in wild animals and plants, and 

 to breed these true to type. This, in all probability, has 



