XIV CONTENTS. 



CHAPTER IX. PAGE 



DEVELOPMENT OF CONNECTIVE SUBSTANCE AND BLOOD (THE 



PARABLAST- AND MESENCHYME-THEORIES) . . 170 



Historical 189 



SUMMARY 191 



CHAPTER X. 



ESTABLISHMENT OF THE EXTERNAL FORM OF THE BODY . 194 

 SUMMABY 206 



CHAPTER XI. 



THE FCETAL MEMBRANES OF REPTILES AND BIRDS . . .206 

 SUMMARY 220 



CHAPTER XII. 



THE FCETAL MEMBRANES OF MAMMALS .221 



SUMMARY . . . . . .238 



CHAPTER XIII. 

 THE FCETAL MEMBRANES OF MAN .... .241 



(1) THE CHORION 248 



(2) AMNION ... . ... 250 



(3) YOLK-SAC . 251 



(4) DECIDU^S . 252 



(5) PLACENTA . 258 



(6) UMBILICAL CORD 268 



SUMMARY .... 272 



PART SECOND. 



CHAPTER XIV. 

 THE ORGANS OF THE INNER GERM-LAYER. THE ALIMENTARY 



TUBE WITH ITS APPENDED ORGANS 281 



I. THE FORMATION OP THE MOUTH, THE THROAT-, GILL-, OR 



VISCERAL CLEFTS, AND THE ANUS 282 



II. THE DIFFERENTIATION OF THE ALIMENTARY TUBE INTO 



SEPARATE REGIONS, AND FORMATION OF THE MESENTERIES 295 

 III. THE DEVELOPMENT OF THE SEPARATE ORGANS OF THE ALI- 

 MENTARY TUBE 304 



A. The Organs of the Oral Cavity : Tongue, Salivary Glands, and 



Teeth 304 



B. The Organs arising from the Pharynx 313 



(1) The Thymus .... . .314 



(2) Thyroid Gland 317 



(3) Lungs and Larynx 320 



C. The Glands of the Small Intestine 324 



(1) The Liver ... 324 



(2) , Pancreas 332 



SUMMARY . . 333 



