CONTENTS xi 



PAGE 



tissue layer Hair Nails Sweat glands Secretion 

 " Pores " *of the skin Inadequacy of the skin's protec- 

 tion Necessity for cleanliness Bathing Sea Bathing 

 Soaps Skin parasites Skin eruptions 200 



CHAPTER XIX 



THE HEAT OF THE BODY 



Warm and cold animals Heat control Loss of heat Cloth- 

 ing Wool Leather and furs Thin or thick clothing 

 Bed clothing Arrangement of bed clothing Fall in 

 body temperature Alcohol Freezing Rise in body 

 temperature 211 



CHAPTER XX 



THE NERVOUS SYSTEM 



General arrangement Nerves Spinal nerves Nerve struc- 

 ture Course of a motor nerve Neurons Motor neurons 

 Course of a sensory nerve Direction of nervous im- 

 pulses Spinal cord Motor impulses from sensory Re- 

 flex action Its characteristics Branches of spinal 

 nerves Sympathetic system Spinal bulb Cerebellum 

 Cerebrum Brain convolutions Gray matter White 

 matter Protection of brain Cranial nerves Reflex 

 action Voluntary action Habits 219 



CHAPTER XXI 



USE AXD CARE OF THE NERVOUS SYSTEM 



Activity of the nervous system Value of sleep Amount of 

 sleep Habits of sleep Nervous breakdown Value of 

 work Amount of work Method of work Meaning of 

 pain 241 



CHAPTER XXII 



THE SPECIAL SENSES 



Evolution of the special senses Special senses Touch 

 Other dermal senses Fatigue End organs Kinds of 

 taste Structure Influence upon taste External ear 

 Middle ear Eustachian tube Inner ear Receiving ap- 

 paratus Sensation of sound Semicircular canals Na- 

 ture of light General structure Detailed structure 

 Formation of image Adjustment of lens Flexibility of 



