CONTENTS. 



Introduction 



Preservation and Mounting 

 Methods of Study 

 Age of the Embryos 

 Externa] Appearance 

 Amnion 



('[union 



[ntegument and Epithelial Thick* 

 Mesodermic Somites . . 



The Notochord 



Alimentary System 20 



Circulatory System . . . . 25 



[Jrinogenital System 30 



Septum Tiansversum and Ccelom 3o 



Sense ( Irfians 36 



Nervous System 37 



Conclusion 42 



Bibliography 43 



l.isi nf Abbreviations used in Illustrations 41 



