XIV CONTENTS. 



CHAPTER VIII. 



FORMATION OF THE EMBRYO IN THE FOWL'S EGG. 



PAGE 



Development of the chick The yolk and the cicatricula Formation of the 

 blastoderm Folds of the blastoderm Position of the embryo in the egg 

 Division of the blastodermic layers Outer and inner lamina} of the blasto- 

 derm Primitive vertebrae Formation of the spinal column and its mus- 

 cles 729-737 



CHAPTER IX. 



DEVELOPMENT OF ACCESSORY ORGANS IN THE IMPREGNATED EGG. 

 UMBILICAL VESICLE, AMNION, AND ALLANTOIS. 



Nature and function of the accessory embryonic organs Umbilical vesicle 

 Amnion Allantois Physiological action of the allantois Exhalation of 

 water in the fowl's egg Respiration and absorption of nourishment by the 

 allantois Escape of the chick at maturity from the egg-shell . . 738-744 



CHAPTER X. 



DEVELOPMENT OF THE IMPREGNATED EGG AND ITS MEMBRANES IN 

 THE HUMAN SPECIES. AMNION AND CHORION. 



Membranous envelopes of the human foetus Amnion Its enlargement 

 Amniotic fluid Chorion Early formation of the chorion Villosities of 

 the chorion Development of bloodvessels of the chorion Partial disappear- 

 ance of its villosities Their further development at the situation of the 

 placenta 745.749 



CHAPTER XI. 



DEVELOPMENT OF THE DECIDUAL MEMBRANE, AND ATTACHMENT OF 

 THE EGG TO THE UTERUS. 



Mucous membrane of the unimpregnated uterus Uterine tubules Decidua 

 vera Hypertrophy of the uterine mucous membrane after impregnation 

 Decidua reflexa Enclosure of egg by the decidua reflexa Attachment of 

 the egg to the uterine mucous membrane Corresponding development of 

 the chorion and decidua 750-754 



CHAPTER XII. 



THE PLACENTA. 



Source of nourishment for the foetus in man and mammalians Relations of 

 the allantois and uterine mucous membrane In the pig In ruminating 

 animals In carnivora In man Vascular tufts of the placenta Vascular 

 sinuses of the decidua Relation between the two Physiological action of 

 the placenta 755-762 



