TABLE OF CONTENTS. ix 



CHAPTER XX. 

 The Organs of Special Sense. PAGE. 



Common sensations. Special sensations. Structure of an organ 

 of special sense. Neurosis. Psychosis. Development of 

 the special senses. The objectification of our sensations. 

 The relation between neurosis and psychosis. The psycho- 

 physical law. Confusion of sensations and inferences from 

 sensations 469 



CHAPTER XXL. 

 Touch, Temperature, Muscular Sense, Taste, Smell. 



The anatomy of the end organs of touch. Pacinian corpuscles. 

 Tactile cells. End bulbs. Touch corpuscles. The absolute 

 touch sensitiveness. The power of localization and the touch 

 areas. The sense of temperature. The muscular sense. 

 The sense of taste. Taste bulbs. The nature of a taste 

 sensation 477 



CHAPTER XXII. 

 The Ear. 



The nature of sound. The production of sound. The range of 

 the number of vibrations in the production of sound. The 

 transmission of sound in the air and its velocity in the same. 

 Reflection and refraction of sound. The physical proper- 

 ties of sound. Harmony. Sympathetic vibrations. The 

 external ear. The middle ear. The membranous ear. 

 Histology of the membranous labyrinth. The minute struc- 

 ture of the membranous cochlea. The functions of the in- 

 dividual parts of the membranous ear. The localization of 

 sound 494 



CHAPTER XXIII. 

 The Eye and the Physiology of Vision. 



Historical. The nature of light. The rate of transmission. The 

 number of vibrations in waves of light. The spectrum. 

 Complementary colors. The colors of objects by transmitted 

 or reflected light. The refraction of light and the property 

 of lenses. The formation of images by lenses. The anat- 

 omy of the eye (eyebrows, eyelids, lachrymal apparatus, 

 muscles of the eyeball, the globe of the eye, sclerotic coat, 

 choroid coat, ciliary muscles and the muscles of accomoda- 



