XVlll LIST OF ILLUSTRATIONS. 



FIG. PAQE 



130. The left half of ths skeleton of the common fowl. (From Marshall 



and Hurst) 325 



131. The skull of a chick embryo at the end of the eighth day of incu- 



bation 329 



132. The skull of the fowl, from the right side. (From Marshall and 



Hurst) 331 



THE RABBIT 



133. Section through part of the ovary of an adult rabbit . . . 347 

 131. A fully formed ovum of a rabbit, shortly before its discharge from 



the ovary. (After Bischofif) 350 



135. A rabbit's ovum, from the upper end of the oviduct, after extrusion 



of the two polar bodies. (After Bischoff) 350 



136. A rabbit's ovum, about twenty-two hours after copulation, showing 



division of the ovum into two cells. (After Bischoff) . . 353 



137. A rabbit's ovum about the middle of the third day, showing the 



morula stage, shortly before the completion of segmentation. 

 (After Bischoff) 353 



138. A rabbit's ovum seventy hours after copulation, showing the condi- 



tion at the close of segmentation. (After Van Beneden) . . 354 



139. A rabbit's ovum seventy-five hours after copulation, showing the 



first stage in the formation of the blastodermic vesicle. (After 

 Van Beneden) 354 



140. Section of the blastodermic vesicle of a rabbit at the end of the 



fourth day. (After Van Beneden) 355 



141. A vertical section across the embryonal area of the blastodermic 



vesicle of a rabbit at the end of the fifth day. (After Kolliker) 359 



142. A transverse section across the hinder part of the embryonal area of 



a rabbit embryo at the end of the seventh day. (After Kolliker) 359 



143. The blastodermic vesicle of a rabbit at the end of the seventh day. 



(Modified from Kolliker) . 360 



144. The embryonal area of a rabbit at the middle of the eighth day. 



(Modified from Kolliker) . . 360 



145. A rabbit embryo and blastodermic vesicle at the end of the ninth day 363 



146. A median longitudinal, or sagittal, section through a rabbit embryo 



and blastodermic vesicle at the end of the ninth day. (In part 

 after Van Beneden and Julin) 364 



1 47. A rabbit embryo and blastodermic vesicle at the end of the tenth 



day. (In part after Van Beneden and Julin) .... 365 



148. A rabbit embryo and fostal appendages at the end of the twelfth 



day. (In part after Van Beneden and Julin) .... 366 



149. A rabbit embryo of the twentieth day 367 



150. A median longitudinal, or sagittal, section through a rabbit embryo 



at the end of the twelfth day 373 



151. A median longitudinal, or sagittal, section through the head of a 



rabbit embryo of the eighteenth day 375 



152. The brain of an adult rabbit, dissected from above. (From Marshall 



and Hurst) 377 



153. A median longitudinal, or sagittal, section of the brain of an adult 



rabbit. (From Marshall and Hurst) 378 



