xii CONTENTS. 



CHAPTER XX. 



PAGE 



THE SENSE OF SIGHT 285 



Protection of the Eye. The Lacrymal Secretion. External Parts of 

 the Eye. The Conjunctiva. Muscles of the Eyeball. Movements 

 of the Eye. Coats of the Eye. The Sclerotic Coat. The Choroid 

 Coat. The Retina. The Cornea. The Iris. The Pupil. Regula- 

 tion of the Amount of Light admitted into the Eye. The Refract- 

 ing Media of the Eye. The Aqueous Humor. The Vitreous Humor. 

 The Crystalline Lens. The Lens Capsule. The Hyaloid Mem- 

 brane. The Ciliary Muscle. Inversion of the Image. Adjustment 

 for Distance. Action of the Ciliary Muscle. Defects of Eyesight. 

 Structure of the Retina. Importance of the Retina. The Blind 

 Spot. The Optic Nerve not Sensitive to Light. Sympathy between 

 the Eyes. Pain in the Eyes. Color Sensations. Color Blindness. 

 Stereoscopic Vision. After-images. Care of the Eyes. 



CHAPTER XXI. 



TASTE, SMELL, AND HEARING 301 



Uses of the Sense of Taste. The Papillae. Nerve Supply of the 

 Tongue. Solution Necessary for Tasting. Flavors. Effect of 

 Temperature on Taste. The Sense of Smell. Why we Sniff. The 

 Sense of Hearing. The External Ear. The Tympanum. The 

 Middle Ear. The Eustachian Tube. The Internal Ear. The Pro- 

 duction of Sound. The Equilibrium Sense. The Care of the Ear. 

 The Use of the Ears. 



CHAPTER XXII. 

 THE VOICE 309 



The Ear and the Voice. What we can learn from our own Throats. 

 The Vocal Cords. Reenforcement of Sound. Pitch and Voice. 

 Voice and Speech. Vowels and Consonants. Difference between 

 Voices. Hoarseness. Whispering. Culture of the Voice. 



CHAPTER XXIII. 



ACCIDENTS. WHAT TO DO TILL THE DOCTOR COMES 314 



How to stop Flow of Blood from Arteries. Bleeding from the Upper 

 Arm. Bleeding from the Neck. Wounds in the Thigh. Bleeding 

 from Veins. Hemorrhage of the Lungs or Stomach. Bleeding from 

 the Nose. Treatment of Burns. Danger from Burning Clothing. 



