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Heredity and Environment 



FIG. 86. EFFECT OF TRANSPLANTING OVARIES IN GUINEA-PIGS. Above, 

 young black female; in the middle, mature white female; below, mature 

 white male. The white female's ovary was removed and in its place was 

 put the ovary from the black female. The white female (with "black" 

 ovary) was then bred to the white male. (From Castle.) 



