4 5 6 



15 



18 



Fin. 1.'18. Grades 1-18 of white spotting as M-cn in Dutch ruhbits. By systematic selection the average 

 grade of a race of Dutch rabbits may be gradually but p<'rmanently changed either in a plus or in a 

 minus direction. Dutch spotting is allelomorphic with English (Fig. 123). 



