xviii LIST OF ILLUSTRATIONS. 



FIGURE PAGE 



254. Muscles of the eyeball. (Sappey.) 808 



255. Diagram illustrating the action of the muscles of the eyeball. (Fick.) 809 



256. Lachrymal and Meibomian glands. (Sappey.) 813 



257. Lachrymal canals, lachrymal sac, and nasal canal. (Sappey.) 814 



258. General view of the organ of hearing. (Sappey.). 819 



259. Ossicles of the tympanum. (Arnold.) 820 



260. Ossicles seen from within. (Riidinger.) 820 



261. Bony labyrinth. (Riidinger.) 823 



262. Resonators of Helmholtz 831 



263. Membrani tympani. (Riidinger.) 836 



264. Diagram of the labyrinth. Vestibule and semicircular canals. (Riidinger.) 843 



265. Otoliths from various animals. (Riidinger.) 844 



266. Section of the first turn of the spiral canal. Section of the cochlea. (Riidinger.) 845 



267. Distribution of the cochlear nerve in the spiral canal. (Sappey.) 847 



268. The two pillars of the organ of Corti. (Sappey.) 848 



269. Vertical section of the organ of Corti. (Waldeyer.) 848 



270. Uterus, Fallopian tubes, and ovaries. ^Sappey.) 858 



271. Section of the ovary. (Waldeyer.) 861 



272. Graafian follicle. (Luschka.) 862 



273. Virgin uterus. (Sappey.). 863 



274. Muscular fibres of the uterus. (Sappey.) 864 



275. Superficial muscular fibres of the uterus. (Liegeois.) 865 



276. Inner layer of muscular fibres of the uterus. (Liegeois.) 866 



277. Blood-vessels of the uterus and ovaries. (Rouget.) 867 



278. Fallopian tube. (Liegeois.) 868 



279. External erectile organs of the female. (Liegeois.) 869 



280. Ovum of the rabbit. (Waldeyer.) 871 



281. Sections of two corpora lutea. (Kolliker.) 877 



282. Testicle and epididyrnis. (Arnold.) 881 



283. Vas deferens, vesiculae seminales, and ejaculatory duct. (Liegeois.) 882 



284. Human spermatozoids. (Luschka.) 885 



285. Development of spermatozoids. (Liegeois.) 886 



286. Mulatto woman with twins, one white and the other black ; from a photograph 895 



287. Penetration of spermatozoids through the vitelline membrane. (Haeckel.) 896 



288. Formation of the polar globule. (Robin.) 897 



289. Segmentation of the vitellus. (Liegeois.) 898 



290. Primitive trace of the embryon. (Liegeois.) 899 



291. Formation of the membranes. (Kolliker.) 902 



292. Villi of the chorion. (Haeckel.) 905 



293. Placenta and deciduse. (Liegeois.) 910 



294-296. Development of the chick. (Briicke.) 913 



297. Development of the notocorde. (Robin.) 915 



298. Human embryon one month old. (Dalton.) 915 



299. Development of the nervous system of the chick. (Wagner.) 917 



300. Development of the spinal cord and brain of the human subject. (Tiedemann.) 918 



301. Fo3tal pig, showing umbilical hernia. (Dalton.) 920 



302. Development of the bronchial tubes and lungs. (Rathke and Miiller.) 922 



303-305. Development of the face. (Coste.) 924, 925 



306. Temporary and permanent teeth. (Sappey.) 926 



307. Foatal pig, showing the Wolffian bodies. (Dalton.) 927 



308. Diagrammatic representation of the genito-urinary system. (Henle.) 929 



309. Area vasculosa. (Bischoff.) 932 



310. Aortic arches in the mammalia. (Von Baer.) 933 



311. Diagram of the foetal circulation . 937 



312. The Siamese twins 942 



313. Cholesterine extracted from meconium. . . 944 



