xxvi LIST OF TEXT-ILLUSTRATIONS 



219. Formation of the blastodermic vesicle (van Beneden) 796 



220. Four stages in segmentation of the ovum of a mouse (Sobotta) 797 



221. Later stages of segmentation of the ovum of a bat (van Beneden) .... 798 



222. Embryonic shield of a rabbit, showing the primitive streak and the medullary groove 



above (Kollmann) 800 



223. Transverse section of the embryonic area of a dog's ovum of about fifteen days 



(Bonnet) 801 



224. Five diagrammatic representations of the formation of membranes in mammalia 



(A'olliker) .803 



225. Embryo of twenty to twenty-five days (Coste) ........ 807 



226. Human embryo of the fourth to the fifth week prepared by Dr. G. R. Corson, of 



Savannah, Ga. (Gage) . . . . 808 



227. Seventeen days' gravid uterus from the Anatomical Museum of Johns Hopkins 



University embryo drawn relatively too large ( Williams) . . .812 



228. Early stage of development of the chick (Seboth and Brucke) . . . . * .817 



229. Transverse section near the head (Seboth a nd Brucke) . ... . .817 



230. Later stage of development of the chick (Seboth and Brucke) . . . '. . 818 



231. The first six cervical vertebrse of the embryo of a rabbit (Robin) . . . . 819 



232. Human embryo about one month old, showing the large size of the head and upper 



parts of the body, the twisted form of the spinal column, the rudimentary condi- 

 tion of the upper and lower extremities and the rudimentary tail at the end of 

 the spinal column (Daltori) 820 



233. Development of the nervous system of the chick ( Wagner) ..... 823 



234. Development of the spinal cord and brain of the human subject ( Tiedemann) . 824 



235. Fcetal pig, showing a loop of intestine forming an umbilical hernia (Dalton) . . 827 



236. Formation of the bronchial ramifications and of the pulmonary cells (Rathke and 



/. Mutter) .829 



237. Mouth of a human embryo of twenty-five to twenty-eight days (Coste) . . . 830 



238. Mouth of a human embryo of thirty-five days (Coste) . . . . .831 



239. Mouth of a human embryo of forty days (Coste) . . . ..-.-. 831 



240. Temporary and permanent teeth (Sappey) .* 834 



241. Fcetal pig f of an inch (16 millimeters) long (Dalton) 836 



242. Diagrammatic representation of the genito-urinary system (Henle) .... 838 



243. Area vasculosa of a rabbit of ten days (van Beneden and Julin) ._ ' . . 840 



244. Area vasculosa of a rabbit of eleven days (van Beneden and Julin) ... . 841 



245. Arterial arches in man and mammals (modified from Rathke) . . , . . 844 



246. Diagram of the foetal circulation (Kollmanri) . . . &47 



247. Cholesterin extracted from meconium . . . 855 



