Fig. 2. A Papilla of the Skin. 1, 1, Two papillæ, formed of an artery vein, and nerve. 2, 2, 2, 2, Nerves forming a loop in the papillæ. 3, 3, Arteries of the papillæ. 4, 4, Veins of the papillæ. 5, 5, A net-work of arteries, veins, and nerves. 6, 6, Nerves of the skin. 8, 8, Arteries of the skin. 7, 7, Veins of the skin.
Fig. 3. A Hair, and its Oil-Glands. 1, 1, The hair. 2, 2, The sheath of the hair. 3, Oil-glands that surround the bulb of the hair, the ducts of which open into the sheath of the hair, (2, 2.)
Fig. 4. A Section of the Skin. 1, 1, The cuticle. 2, 2, Its colored portion. 3, 3, The papillary layer. 4, 4, A net-work of arteries, veins, and nerves, upon the upper surface of the cutis vera. 5, 5, 5, 5, The cutis vera, (true skin.) 6, 6, 6, Hairs that originate in the cutis vera. 7, 7, 7, Oil-glands, the ducts of which connect with the sheath of the hair. 8, 8, 8, 8, 8, 8, 8, 8, Perspiratory glands and their ducts. 9, 9, 9, 9, 9, Nerves of the skin 10, 10, 10, 10, 10, Arteries of the skin. 11, 11, 11, 11, 11, Veins of the skin. 12, 12, 12, 12, Papillæ, or ridges of the skin.
PLATE X.
AN ANTERO-POSTERIOR SECTION OF THE EYE.
Fig. 1. 1, 1, The sclerotic coat. 2, 2, The cornea. 3, 3, The choroid coat. 4, 4, The retina. 5, 5, The iris. 6, 6, The posterior chamber of the eye that contains the aqueous humor. 7, 7, The anterior chamber. 8, 8, The pupil. 9, The crystalline humor. 10, 10, The vitreous humor 11, The optic nerve. 12, A representation of a pen. 13, An inverted image of the pen (12) on the retina. 14, 14, A canal surrounding the crystalline humor. 15, 15, The bevelled junction of the cornea and sclerotic 475 coats. A, a perpendicular ray of light from the pen. B, B, oblique rays, that are refracted in passing through the humors of the eye.
Fig. 2. A View of the External, Middle, and Internal Ear. 1, 1, The external ear. 2, The meatus auditorius externus, (the tube that connects with the middle ear.) 3. The membrana tympani, (drum of the ear.) 8, 8, The tympanum, (middle ear.) 4, The malleus. 5, The incus. 6, The orbicularis. 7, The stapes, (stirrup-bone,) that connects with the vestibule of the internal ear. 9, 9, (4, 5, 6, 7, The small bones of the middle ear,) 10, 11, 12, The semicircular canals. 13, 13, The cochlea. 14, The auditory nerve. 15, The division of the auditory nerve to the semicircular canals. 16, The division to the cochlea. 17, 17, The Eustachian tube. 18, The chorda tympani nerve. 19, The seventh pair (facial) nerve. 20, The styloid process of the temporal bone. 21, 21, 21, 21, 21, The petrous or hard portion of the temporal bone, in which the parts of the middle and internal ear are situated.
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