XIV . CONTENTS. 



CHAPTEE 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 

 SUMMARY ..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 . . . v . ... 250 



(3) YOLK-SAC . . . . . . .... 251 



(4) DECIDUJS . ......... 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 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 ALL- 



MENTARY TUBE . . I .,.. . . . . 304 



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



Teeth .304 



S. 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 



