CONTKNTS 



15. The skin The glands of the skin Composition ami secre- 



tion of sweat Nails Hairs 167 



16. Animal heat The temperature of the body Loss of heat 



Source of heat Distribution of heat Regulation of heat 173 



17. The nervous system Afferent and efferent nerves Structure 



of nerves Nerve cells Membranes of the brain and 

 spinal cord Structure of the spinal cord The spinal 

 nerves Nature of the white and grey matter and origin 

 of the nerve roots - - Function of the nerve roots 

 Functions of the spinal cord Reflex action The brain 

 The cranial nerves Functions of the spinal bulb 

 Functions of the cerebral hemispheres The sympathetic 

 nervous system . . . . 177 



18. Sensation Touch Temperature sensations Muscular 



sensations Taste Smell .... 195 



19. The eye and the sense of sight Protection and movements 



of the eyeball General structure of the eye The forma- 

 tion of clear images on the retina Accommodation- 

 Short sight and long sight Action of the iris Structure 

 of the retina Visual sensations .... 202 



20. The ear and the sense of hearing The external ear The 



middle ear The internal ear The cochlea Sound 



The transmission of vibrations in the ear . . . 220 



21. Structure of the larynx The production of voice Speech . 229 



