CONTENTS. xi 



PAGE 



Sagittal Section through the Right Lung and Kidney, 250 



Frontal Sections of the Head, 253 



Pig Embryo of 24 mm. (Studied in Sections), 259 



Frontal Section through the Eye 259 



Median Sagittal Section, 263 



CHAPTER V. STUDY OF YOUNG CHICK EMBRYOS, 269-304 



Method of Obtaining Embryos, 269 



Embryo Chick with Twenty-four Segments, , 272 



Embryo Chick with Twenty-eight Segments, 274 



The Study of Transverse Sections, 274 



Horizontal Section, 290 



Histological Differentiation of Chick Embryo with Three Gill-clefts, 293 



Embryo Chick with Seven Segments, 295 



Examination in the Fresh State, 295 



Examination after Hardening, 297 



Comparison with a Rabbit Embryo, 297 



Longitudinal Section, 297 



Study of Transverse Sections, 299 



CHAPTER VI. STUDY OF THE BLASTODERMIC VESICLE AND THE SEGMENTATION OF THE OVUM, . 305-315 



Method of Obtaining Blastodermic Vesicles from the Rabbit, 305 



Study of Rabbit Blastodermic Vesicles in Alcohol, 306 



The Maturation, Fertilization, and Segmentation of the Ovum in White Mice, 312 



The First Polar Globule, 3*3 



The Second Polar Globule, 3*3 



The Single Polar Globule, 3'4 



Fertilization, 3 I 5 



CHAPTER VII. STUDY OF THE UTERUS AND THE FCETAL APPENDAGES IN MAN, 316-355 



Histology of the Uterus, 316 



Menstruation, 3*6 



Decidua Menstrualis, 317 



The Pregnant Uterus: the Two Stages, 319 



The Human Uterus Three Months Pregnant, 319 



Human Uterus Seven Months Pregnant, 321 



Decidua Vera of the First Stage in Section, 322 



Decidua Reflexa of the First Stage, 3 2 S 



Decidua Vera and Chorion Lseve of the Second Stage, 327 



The Placenta in Situ, . 3 2 9 



Decidua Serotina at Seven Months, 334 



The Human Placenta, ... 33 



Histology of the Human Chorion, 34 l 



The Chorion with Trophoblast 34 2 



The Chorionic Villi, 345 



The Structure of the Amnion, 349 



The Umbilical Cord, . . _ 35 1 



The Structure of the Human Yolk-sac, 354 



CHAPTER VIII. METHODS, 356-37 



Measuring the Length of Embryos, . 356 



Methods of Reconstruction, 356 



Reconstruction of Drawings, 356 



Reconstruction with Wax-plates, 35^ 



Directions for Orienting Serial Sections, 36 



Microtomes, 36 



Methods of Hardening and Preserving, 363 



Preservation in Alcohol, 365 



Directions for Imbedding Specimens to be Microtomed, 365 



Method of Mounting Paraffin Sections, 3^ , ^66 



Methods of Staining, 367 



INDEX, 371 



