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arisen in nature and differ definitely and strikingly from each other, yet any two differ by only one factor difference.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Critique_of_the_Theory_of_Evolution_Fig_044.jpg/232px-Critique_of_the_Theory_of_Evolution_Fig_044.jpg)
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