x CONTENTS. 



PAGE 



CHAPTER XXIII. 



A UDITION. 



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 the parts 



composing the middle ear Anatomy of the tympanum Arrangement of the ossicles of the ear 



Muscles of the middle ear Mastoid cells Eustachian tube Muscles of the Eustachian tube Gen- 

 eral arrangement of the bony labyrinth Physics of sound Noise and musical sounds Pitch of 

 musical sounds Musical scale Quality of musical sounds Harmonics, or overtones Resultant 

 tones Summation tones Harmony Discords Tones by influence Uses of different parts of the 

 auditory apparatus Structure of the membrana tympani Uses of the membrana tympani Mechan- 

 ism of the ossicles of the ear Physiological anatomy of the internal ear General arrangement of 

 the membranous labyrinth Liquids of the labyrinth Distribution of nerves in the labyrinth Or- 

 gan of Corti Uses of different parts of the internal ear Centres for audition . . . .728 



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CHAPTER XXIV. 



ORGANS AND ELEMENTS OF GENERATION. 



General considerations Female organs of generation General arrangement of the female organs 

 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 menstrua- 

 tion Changes in the Graafian follicle after its rupture (corpus luteum) Male organs of genera- 

 tionThe testicles Vesiculae seminales Prostate Glands of the urethra Male elements of gen- 

 eration Spermatozoids . . . . . . . . ... . . .765 



CHAPTER XXV. 



FECUNDATION AND DEVELOPMENT OF THE OVUM. 



General considerations Fecundation Changes in the fecundated ovum Segmentation of the vitell- 

 us Primitive trace Blastodermic layers Formation of the membranes Amniotic fluid Umbilical 

 vesicle Formation of the allantois and the permanent chorion Umbilical cord Membranae de- 

 ciduae Formation of the placenta Uses of the placenta Development of the ovum Development 

 of the cavities and layers of the trunk in the chick Vertebral column Development of the skele- 

 ton Development of the muscles Development of the skin Development of the nervous system 

 Development of the organs of special sense Development of the digestive apparatus Develop- 

 ment of the respiratory apparatus Development of the face Development of the teeth Develop- 

 ment of the genito-urinary apparatus Development of the circulatory apparatus Description of 

 the foetal circulation ............ 793 



CHAPTER XXVI. 



FCETAL LIFE-DEVELOPMENT AFTER BIRTH DEATH. 



Enlargement of the uterus in pregnancy Duration of pregnancy Size, weight and position of the 

 foetus The foetus at different stages of intrauterine life Multiple pregnancy Cause of the first 

 contractions of the uterus, in normal parturition Involution of the uterus Meconium Dextral 

 pre-eminence Development after birth Ages Death Cadaveric rigidity (rigor mortis) . . 842 



