DEVELOPMENT IN MALES 43 



a retrograde metamorphosis in that sex. This 

 assumption is in agreement with the fact 

 that in the lowest Mammals, the Monotremes, 

 the mammary' glands in both sexes show 

 exactly the same development, whilst in 

 the males in the higher orders of Mammals 

 they show a merely rudimentary condition. 

 Had transference from female to male taken 

 place, one would have expected just the 

 reverse. 



