xvi LIST OF ILLUSTRATIONS. 



FIGURE PAO3 



248. Connection of the rods and cones of the retina with the nervous elements (Sappey). . . 683 



249. Blood-vessels of the retina (Loring) 685 



250. Crystalline lens, anterior view (Babuchin) 686 



251. Section of the crystalline lens (Babuchin) 686 



252. Zone of Zinn (Sappey) 687 



253. Section of the human eye 689 



'^54. Refraction by convex lenses 694 



255. Achromatic lens 697 



256. Section of the lens, etc., showing the mechanism of accommodation (Fick) 710 



257. Field of vision (Nettleship, after Landolt) 712 



258. Binocular field of vision (Nettleship, after Forster) 714 



259. Muscles of the eyeball (Sappey) 718 



260. Diagram illustrating the action of the muscles of the eyeball (Fick) 720 



261. Lachrymal and Meibomian glands (Sappey) 726 



262. Lachrymal canals, lachrymal sac and nasal canal (Sappey). ... 727 



263. General view of the organ of hearing (Sappey) 732 



264. Ossicles of the tympanum (Arnold) 733 



265. Ossicles, seen from within (Riidinger) , 734 



266. Bony labyrinth (Rudinger) 736 



267. Resonators of Helmholtz 744 



268. Membrani tympani (Rudinger) 749 



269. Diagram of the labyrinth vestibule and semicircular canals (Rudinger) 756 



270. Otoliths from various animals (Rudinger). . . ( 757 



271. Section of the first turn of the spiral canal section of the cochlea (Rudinger) 758 



272. Distribution of the cochlear nerve in the spiral canal (Sappey) 760 



273. The two pillars of the organ of Corti (Sappey) 761 



274. Vertical section of the organ of Corti (Waldeyer) 761 



275. Uterus, Fallopian tubes and ovaries (Sappey) 767 



276. Section of the ovary (Waldeyer) 770 



277. Virgin uterus (Sappey) 771 



278. Muscular fibres of the uterus (Sappey) 772 



279. Superficial muscular fibres of the uterus (Liegeois) 773 



280. Inner layer of muscular fibres of the uterus (Liegeois) 773 



281. Blood-vessels of the uterus and ovaries (Rouget) 775 



282. Section through the right Fallopian tube (Richard) 776 



283. External erectile organs of the female (Liegeois) 777 



284. Ovum of the rabbit (reduced from Waldeyer) 778 



285. Sections of two corpora lutea (Kolliker) 783 



286. Testicle and epididymis (Arnold) 786 



287. Vas deferens, vesiculae seminales and ejaculatory ducts (Liegeois) 788 



288. Spermatozoids, spermatic crystals, leucocytes etc., (Peyer) 791 



289. Human spermatozoids (Landois) 791 



290. Spermatogenesis, semi-diagrammatic (Landois) 792 



291. Ovum of the nephilis vulgaris, showing penetration of spermatozoids and retraction of 



the vitellus (Robin) 796 



292. Mulatto woman with twins, one white and the other black 798 



293. Segmentation of the vitellus (Haeckel) 800 



294. Primitive trace of the embryon (Liogeois) 801 



295. Formation of the membranes (Kolliker) 804 



296. Villi of the chorion (Haeckel) 808 



297. Placenta and deciduae (Liegeois) 811 



298-300. Development of the chick (Briicke) 814, 815 



301. Development of the notochord (Robin) 816 



