XIV CONTENTS 



CHAPTER XIV 



THE EAR. HEARING AND EQUILIBRATION. TASTE AND SMELL 



PAGE 



Functions of the ear. Sounds. Sympathetic resonance. The external 

 ear. Functions of the tympanic membrane. The middle ear. Auditory 

 ossicles. Internal ear. Bony labyrinth. Membraneous labyrinth. Or- 

 gan of Corti. Function of the cochlea. Auditory perceptions. Nerve- 

 endings in semicircular canals and vestibule. Equilibrium sense. Smell. 

 Taste. 223 



CHAPTER XV 



THE EYE AS AN OPTICAL INSTRUMENT 



The essential structure of an eye. Appendages of the eye. Lachrymal 

 apparatus. Muscles of eye. Anatomy of eyeball. Optic nerves, chiasma, 

 and tracts. Retina. Refracting media of the eye. Ciliary muscle. Prop- 

 erties of light. Refraction. Wide range of clear vision in the resting eye. 

 Accommodation. Defects of the eye. Hygiene of the eyes 243 



CHAPTER XVI 



THE EYE AS A SENSORY APPARATUS 



The excitation of the visual apparatus. Intensity of visual sensations. 

 Function of the rods. Visual purple. Duration of luminous sensations. 

 Localizing power of retina. Color vision. Function of the cones. Dis- 

 tribution of color sense over the retina. Color blindness. After images. 

 Contrasts. Theories of color vision. Visual perceptions. Vision with two 

 eyes. Perception of solidity 267 



CHAPTER XVII 



THE STRUCTURE AND FUNCTIONS OF BLOOD AND LYMPH 



The external medium. The internal medium. Blood. Lymph. Re- 

 newal of lymph. Lymphatic vessels. Lacteals. Composition of blood. 

 Red corpuscles. Hemoglobin. Origin and fate of red corpuscles. Spleen. 

 Function of the spleen. Leucocytes. Blood plates. Plasma. Quantity 

 of blood. Blood of other animals. Histology and chemistry of lymph . . 290 



CHAPTER XVIII 



THE HORMONE-CARRYING AND DISEASE-RESISTING FUNCTIONS OF THE BLOOD. 



BLOOD CLOTTING 



Hormones. Infection. Resistance to infection. Recovery from in- 

 fection. Opsonins, immune bodies, and agglutinins. Antitoxin. Im- 

 munity. Carriers. The use of antitoxin in disease. Protective inoculation. 



