xvi LIST OF ILLUSTRATIONS. 



FIG. PAGE 



149. Rabbit Embryo of Thirteen Days ; Section of the Eye, 260 



150. Pig, 24.0 mm. Transverse Series 62, Section 428, 261 



151. Pig, 24.0 mm. Sagittal Series 63, Section 30, 264 



152. Embryo Chick with about Twenty-four Segments. Surface View from the Dorsal Side, 272 



153. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 73, . . 275 



154. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 83, . . 275 



155. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 96, . . 276 



156. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 104, . 277 



157. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 114, . 279 



158. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 144, . 281 



159. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 165, . 284 



160. Section of Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 179, . 285 



161. Section of a Chicken Embryo with about Twenty-eight Segments. Transverse Series 92, Section 220, 286 



162. Section of a Chicken Embryo with about Twenty-eight Segments. Transverse Series 92, Section 356, 287 



163. Section of a Chicken Embryo with Twenty-eight Segments. Transverse Series 92, Section 419, . . . 288 



164. Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 424, 289 



165. Chick Embryo with about Twenty-eight Segments. Transverse Series 92, Section 427, 290 



166. Horizontal Section of a Chick Embryo with about Twenty-eight Segments, 291 



167. Chicken Embryo, after Twenty-seven Hours' Incubation, with Eight Primitive Segments (after 



Duval), 296 



168. Embryonic Area of a Rabbit of (? Nine) Days, with the Placental Area Partly Torn off (after van 



Beneden and Julin), 298 



169. Longitudinal Section of a Young Chick Embryo, 298 



170. Chick Embryo with Seven Segments. Transverse Section of the Head, 299 



171. Chicken Embryo with Seven Segments. Transverse Section through the Anlage of the Heart, . , 300 



172. Chicken Embryo, Transverse Section across the Anlage of the Heart in a Stage slightly more Ad- 



vanced than Fig. 171, 301 



173. Chicken Embryo with Seven Segments, 302 



174. Chicken Embryo with Seven Segments. Transverse Section across the Primitive Groove, .... 303 



175. Blastodermic Vesicle of a Rabbit at Seven Days, 309 



176. Rabbit Embryo of Seven Days. Transverse Series 12, Section 216, through the Anterior Portion 



of the Embryonic Shield, 310 



177. Rabbit Embryo of Seven Days. Transverse Series 15, Section 39, through the Posterior Part of 



the Embryonic Shield, .... ... 311 



178. Ovum of White Mouse, with the First Polar Spindle in Tangential Position (after J. Sobotta), . . . 313 



179. Ovum of White Mouse, dividing to Produce the Polar Globule (after J. Sobotta), 314 



180. Ovum of White Mouse, Showing the Metaphase of the Division Producing the First Polar Globule 



(after J. Sobotta}, 314 



181. Ovum of White Mouse, after the Formation of the Polar Globule. Both Pro-nuclei are Present 



(after J. Sobotta), 315 



182. Ovum of White Mouse, with Two Well-developed Pro-nuclei (after J. Sobotta), 315 



183. Vertical Section of a Human Uterus of the First Day of Menstruation, 318 



184. Vertical Section of a Human Uterus (Decidua vera), One Month Pregnant, 323 



185. Human Uterus, One Month Pregnant. Section of Gland from the Cavernous Layer, with the Epi- 



thelium Partly Adherent to the Walls, 323 



186. Human Uterus, One Month Pregnant. Section of a Gland from the Cavernous Layer with the Epi- 



thelium Loosened from the Walls. The Epithelial Cells are Swollen, . 324 



187. Uterus One Month Pregnant; Portion of the Compact Layer of the Decidua Seen in Vertical 



Section, 325 



188. Section of Human Decidua Reflexa at Two Months, 326 



189. Human Uterus about Seven Months Pregnant. Vertical Section of the Decidua Vera with the 



Foetal Membranes in situ, 328 



190. Human Placenta in situ, about Seven Months. Vertical Section, 330 



191. Human Placental Chorion and Amnion of the Fifth Month, 331 



192. Human Chorion of Seven Months' Placenta, 332 



193. Adenoid Tissue from a Villus of a Human Placenta of Four Months, 334 



194. The Human Decidua Serotina at Seven Months. The Section is Taken from near the Margin of 



the Placenta, 335 



195. Decidual Cells from the Section Represented in Fig. 194, 336 



196. Human Placenta at Full Term, Doubly Injected to show the Superficial Distribution of the Blood- 



vessels, 338 



197. Human Placenta after Delivery at Full Term, 340 



