Page:A critique of the theory of evolution.djvu/97

 arisen in nature and differ definitely and strikingly from each other, yet any two differ by only one factor difference.



Similar relations have been found in a number of domesticated races. In mice there is a quadruple system represented by the gray house mouse, the white bellied, the yellow and the black mouse (fig. 44). In rabbits there is probably a triple system, that includes the albino, the Himalayan, and the black races. In