CONTENTS 



CHAPTEE I 



PAQB 



The Origin of the Mammary Apparatus of the 

 Mammalia and its Structure and Develop- 

 ment IN THE MoNOTREMATA 1 



CHAPTER II 



The Structure and Development of the Maji- 



MARY Apparatus in the Maesupialia 44 



CHAPTER III 



The Development of the Mammary Apparatus 



in the Placentalla — General Conclusions 96 



Bibliography - - - - 141 



Vll 



