CONTENTS. xi 



PAGE 



Embryo Chick with Eight Segments (About Twenty-eight hours' Incubation), 176 



Embryo Chick with about Twenty-four Segments and Three Gill-clefts (About Forty- 

 six Hours' Incubation), 197 



Embryo Chick with Twenty-eight Segments, 199 



The Study of Transverse Sections, 199 



Horizontal Section, 214 



Histological Differentiation of the Chick Embryo with Three Gill-clefts, 216 



CHAPTER VI. STUDY OF PIG EMBRYOS, 219 



Methods of Obtaining Embryos, 219 



The Making of Serial Sections, 220 



Selection of the Planes of Section and the Stages for Practical Study, 220 



The Study of the External Form, 221 



Pig Embryo of 7 . 5 mm., 221 



Pig Embryo of 10 mm., ". 223 



Pig Embryo of 15 mm., 225 



Pig Embryo of 20 mm., 226 



Pig Embryo of 7.8 mm. General Anatomy, 228 



Pig Embryo of 12 mm. General Anatomy, 231 



Pig Embryo of 6 mm. Studied in Sections, 246 



Pig Embryo of 9 mm. Studied in Sections, 250 



Pig Embryo of 12 mm. Studied in Sections', 259 



Study of Transverse Sections, 261 



Study of Sagittal Sections, 290 



Study of Frontal Sections, 296 



Pig Embryo of 17 mm. Study of Sections, 303 



Frontal Section of the Umbilical Cord, 310 



Pig Embryo of 20 mm. Study of Sections, 311 



Transverse Sections 311 



Sagittal Section, 322 



Frontal Sections of the Head, 324 



Pig Embryo of 24 mm. Study of Sections, 330 



CHAPTER VII. STUDY OF THE UTERUS AND THE FETAL APPENDAGES OF MAN, 339 



Histology of the Uterus, 339 



Menstruation, 339 



The Pregnant Uterus: the Two Stages, 341 



Human Uterus Three Months Pregnant, 343 



Human Uterus Seven Months Pregnant, 345 



Decid.ua Vera of the First Stage in Section, 346 



Decidua Reflexa of the First Stage, 349 



Decidua Vera and Chorion Laeve of the Second Stage, 350 



The Placenta in Situ, 352 



Decidua Serotina at Seven Months, 357 



The Human Placenta, 359 



Histology of the Human Chorion, 363 



The Chorion with Trophoderm, 364 



The Chorionic Villi, 367 



The Structure of the Amnion, , 370 



The Umbilical Cord, 372 



The Structure of the Human Yolk-sac, 375 



