WHAT EVOLUTION IS loi 



been taken up; the second remains to 

 be considered. 



In seeking a clue as to the way in 

 which evolution takes place Darwin 

 first turned his attention to plant 

 and animal breeding. Domesticated 

 plants and animals, notwithstanding 

 their great diversity and variety, are 

 the products of comparatively few 

 wild species. Thus all the various 

 races of domesticated pigeons have 

 descended from the European rock- 

 pigeon. The original wild stock of 

 this bird is fairly well represented by 

 the common domesticated individuals 

 of slaty color, with two dark bars on 

 the wings and with a white rump. In 

 addition to this stock there are over 

 150 named varieties of pigeons that 

 breed true. These include such un- 

 usual forms as pouters, carriers, fan- 

 tails, tumblers, jacobins, trumpeters, 

 and a host of others whose forms and 



