CONTENTS. ii 



CHAPTER XX. 



THE GENERAL PHYSIOLOGY OF THE NERVOUS SYSTEM. 



The properties of the nervous system Functions of nerve 

 centres and nerve trunks Sensory and motor nerves Classi- 

 fication of nerve centres Functions of the cerebrum Of 

 the cerebellum Reflex nerve centres Automatic nerve 

 centres Habits Hygiene of the brain Appendix 301 



CHAPTER XXI. 



THE SENSES. 



Common sensation and special senses Hunger and thirst The 

 visual apparatus and its appendages The globe of the eye 

 The retina The blind spot The formation of images on 

 the retina Short sight and long sight Hygiene of the eyes 

 Hearing The tympanum The internal ear Touch 

 The localization of skin sensations The temperature sense 

 Smell Taste 314 



CHAPTER XXII. 



UlA^^ 



VOICE AND SPEECH. 



The production of voice The pitch of the voice Speech- 

 Structure of the larynx The vocal chords Range of the 

 human voice Vowels Semi- vowels Consonants 335 



CHAPTER XXIII. 



ALCOHOL AND OTHER NARCOTICS. 



Introductory Is alcohol a food? Composition and properties 

 of alcohol Alcoholic beverages The direct physiological 

 action of pure alcohol Action of diluted alcohol Absorp- 

 tion of alcohol Primary effects of a moderate dose of 

 alcohol Secondary effects of alcohol Minor diseased con- 

 ditions produced by alcohol Acute alcoholic diseases 

 Delirium tremens Dipsomania Chronic alcoholic diseases 

 Deteriorations of tissue due to alcohol Organs impaired 

 or destroyed by alcohol Moral deterioration produced by 

 alcohol Opium and morphia Chloral Tobacco. ..... 343 



