xviii CONTENTS 



CHAPTER XXVII 

 REFRACTION IN THE EYE ACCOMMODATION 



PAGB 



Refraction in the eye Certain laws of refraction, dispersion etc., bearing on the physiology 

 of vision Refraction by lenses Spherical monochromatic aberration Chromatic 

 aberration Formation of images in the eye Visual purple and visual yellow and 

 accommodation of the eye for different degrees of illumination Mechanism of re- 

 fraction in the eye Astigmatism Movements of the iris Direct action of light 

 on the iris Accommodation of the eye for vision at different distances Changes in 

 the crystalline lens in accommodation Changes in the iris in accommodation 

 Erect impressions produced by images inverted upon the retina Field of indirect 

 vision Binocular vision Corresponding points The horopter Duration of 

 luminous impressions (after-images) Irradiation 667 



CHAPTER XXVIII 

 MOVEMENTS OF THE EYEBALL PARTS FOR PROTECTION OF THE EYE 



Action of the recti muscles Action of the oblique muscles Associated action of the 

 muscles of the eyeball Centres for vision Perception of colors Parts for the 

 protection of the eyeball Muscles that open and close the eyelids Conjunctival 

 mucous membrane The lachrymal apparatus The tears ..,.. 698 



CHAPTER XXIX 



AUDITION 



Auditory (eighth nerve) General properties of the auditory nerves Topographical 

 anatomy of the parts essential to the appreciation of sound The external ear 

 General arrangement of parts composing the middle ear General arrangement of 

 the bony labyrinth Physics of sound Pitch of musical sounds Musical scale 

 Quality of musical sounds Harmonics, or overtones Harmony Discords and 

 dissonance Tones by influence Uses of different parts of the middle ear Struc- 

 ture of the membrana tympani Uses of the membrana tympani Mechanism of 

 the ossicles of the ear Physiological anatomy of the internal ear General arrange- 

 menl of the membranous labyrinth Liquids of the labyrinth Distribution of the 

 nerves in the labyrinth Organ of Corti Uses of different parts of the internal ear 



Uses of the semicircular canals Uses of the parts contained in the cochlea 

 Centres for audition 7 11 



CHAPTER XXX 

 EMBRYOLOGY 



Female organs of generation The ovaries Graafian follicles The parovarium The 

 uterus The Fallopian tubes Structure of the ovum Discharge of the ovum 

 Passage of ova into the Fallopian tubes Puberty and menstruation Changes in 

 the Graafian follicles after their rupture (corpus luteum) Corpus luteum of preg- 

 nancy Male organs of generation Interstitial gland of the testis Vas deferens 



Vesiculse seminales Prostate Glands of the urethra Male element of genera- 

 tion Spermatozoids 753 



