XIV CONTENTS. 



CHAPTER IX. PACE 



DEVELOPMENT OF CONNECTIVE SUBSTANCE AND BLOOD (.THE 



PARABLAST- AND MESENCHYME-THEOKIES) . .170 



Historical .... 189 



SUMMAET . 191 



CHAFTEB X. 



ESTABLISHMENT OF THE EXTERNAL FORM OP THE BODY . 194^ 

 Summary 200'^ 



CHAFTEB XI. 



THE FCETAL MEMBRANES OP REPTILES AND BIRDS . ... 206 

 SuMMAEY ... 220 



CHAFTEK XII. 



THE PffiTAL MEMBRANES OF MAMMALS 221 



Summary .... 2.98 



CHAFTEB XIII. 



THE FCETAL MEMBRANES OF MAN .... .241 



(1) The Choeion 248 



(2) „ Amnion ... . . ... 250 



(3) „ Yolk-Sac . .251 



(4) „ Decidu^ . 252 



(5) „ Placenta . 258 



(6) „ Umbilical Cord 268 



Summary .... 272 



PART SECOND. 

 CHAFTEB XIV. 



THE ORGANS OP THE INNER GEKM-LAYER, THE ALIMENTARY 



TUBE WITH ITS APPENDED ORGANS ... 281 



I. The Formation of 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 



