LIST OF ILLUSTRATIONS. XXvii 



FIG. 



298. Horizontal Section of the Right Eye, gr 2 



299. Perimetric Chart of a Healthy and of a Diseased Eye, 854 



300. Geometric Color-chart, 858 



301. Diagrammatic Representation of the Young- Helmholtz Color Theory . . 859 



302. Lines of Traction and Axes of Rotation of the Ocular Muscles, .' . . 869 



303. Diagrammatic Representation of Identical and Nonidentical Retinal 



Points, 872 



304. Horopter for the Secondary Position, with Convergence of the Visual 



Axes, 872 



305. I, Diagrammatic Representation of Brewster's stereoscope; II, that 



of Wheatstone; III, two stereoscopic drawings; IV, v. Helmholtz's 



telestereoscope, 874 



306. Wheatstone's Prism-pseudoscope, 875 



307. Ewald's Mirror Pseudoscope, 875 



308. Rollett's Glass Plate Apparatus, 878 



309. Vertical Section through the Upper Lid (Waldeyer), 880 



310. Eye of the Cross-spider, 882 



311. Individual Eye of a Libellula Larva (Dragon-fly), 882 



312. Eye of a Sea-snail (Patella coerulea), . . . 883 



313. Eye of a Sea-snail (Haliotis tuberculata) , 883 



314. Diagrammatic Representation of the Auditory Apparatus, 886 



315. The External Auditory Canal, and the Tympanum, 888 



316. Tympanic Membrane and Auditory Ossicles (left) viewed from Within 



(from the tympanic cavity) , 889 



317. Tympanic Membrane of a Newborn Infant, viewed from the Outside, 



with the Handle of the Malleus shining through, 889 



318. Tympanic Membrane and Ossicles (left) viewed from Within, 889 



319. The Auditory Ossicles (right), 891 



320. Tympanic Membrane and Auditory Ossicles (left), enlarged, 892 



321. Tensor Tympani Muscle; the Eustachian Tube (left), 893 



322. Stapedius Muscle (right) , 894 



323. Section through Eustachian Tube (diagrammatic), 895 



324. External Conformation of the Labyrinth, 896 



325. Scheme of the Cochlea, 897 



326. Organ of Corti, 898 



327. Curve of a Muscle Note and Its Overtones, 904 



328. Flame Pictures and Phonautographic Tracings of the Vowels, 906 



329. Olfactory Cells, 914 



330. Nasal Cavity and Nasopharynx, 914 



331. Circumvallate Papilla and Taste-buds, 917 



332 . Vertical Section of Skin, 920 



333. Vater-Pacinian Corpuscle, 921 



334. Spherical End-bulb in the Human Conjunctiva (Longworth) , 921 



335. Longitudinal End-bulb, . 921 



336. Grandry-Merkel Corpuscles, 922 



337. Tactile Discs with Nerves from the Epidermis (snout of the pig) 922 



338. Nerve-endings in the Corneal Epithelium, 923 



339. Compasses for Testing Sensation, 926 



340. Sieveking's Esthesiometer, 926 



341. Pressure Points, 927 



342. Landois' Mercurial Pressure-balance, 929 



343. Cold-points and Heat-points, 931 



344. Topography of the Cold-sense and the Heat-sense on the Same Part 



of the Anterior Surface of the Thigh, 933 



345. Ovum from the Uterus of a Sexually Mature Proglottis of the Taenia 



solium, 938 



346. Encapsulated Cysticerci (from Taenia solium) in the Flesh of the Sar- 



torius Muscle in Man, 938 



347. Cysticerci from Taenia solium, with their Connective-tissue Capsule 



Removed, 938 



348. Cysticercus from Taenia solium with Everted Hollow Bud (Cephalic 



Segment) , 939 



349. Portion of an Echinococcus-cyst with Brood-capsule,. . 939 



350. Taenia mediocanellata 939 



351. Sexually Active (Middle) the Proglottis of Taenia mediocanellata (5<>m- 



tner) , 94 



