xiv CONTENTS. 



PAGE 



THE SENSE OF HEARING 617 



Anatomy of the Organ of Hearing ib. 



Physiology of Hearing 679 



Functions of the External Ear 68 1 



Functions of the Middle Ear ; the Tympanum, Ossicula, 



and Fenestrse 683 



Functions of the Internal Ear 689 



Sensibility of the Auditory Nerve 692 



THE SENSE OF TASTE i .. 697 



THE SENSE OF TOUCH 706 



CHAPTER XX. 



GENERATION AND DEVELOPMENT 713 



Generative Organs of the Female 714. 



Unimpregnated Ovum 718 



Discharge of the Ovum 723 



Corpus Luteum 727 



IMPREGNATION OF THE OVUM 731 



Male Sexual Functions ib. 



DEVELOPMENT 739 



Changes of the Ovum previous to the Formation of the 



Embryo ib. 



Changes of the Ovum within the Uterus .... 742 



The Umbilical Vesicle ....... 745 



The Amnion and Allantois 747 



The Chorion 751 



Changes of the Mucous Membrane of the Uterus and 



Formation of the Placenta 752 



DEVELOPMENT OF ORGANS 758 



Development of the Vertebral Column and Cranium . ib. 



Development of the Face and Visceral Arches . . . 760 



Development of the Extremities ..... 762 



