Control of Heredity: Eugenics 



249 



all of them have descended from the wild rock pigeon (Figs. 

 89, 90) ; or by the numerous races of dogs varying in size from 

 a toy dog to a Great Dane or St. Bernard and showing almost un- 



• rUF&\T' 



Fig. 90. Races of Domestic Pigeons, continued. (From Romanes.) 



