CONTENTS. XI 



CHAPTER XVIII. 



PAGE 



Or VOICE AND SPEECH, 474 



Mode of Production of the Human Voice, .... 474 



The Larynx, 476 



Application of the Voice in Singing and Speaking, . . 483 



SPEECH, 486 



CHAPTER XIX. 



THE SENSES, 489 



THE SENSE OF SMELL, 494 



THE SENSE OF SIGHT, 499 



Structure of the Eye, 499 



Phenomena of Vision, 507 



Reciprocal Action of different parts of the Retina, . . 519 



Simultaneous Action of the two Eyes, . . . ' . 521 



THE SENSE OF HEARING, ....... 527 



Anatomy of the Organ of Hearing, ..... 527 



Physiology of Hearing, ....... 534 



Functions of the External Ear. 535 



Functions of the Middle Ear; the Tympanum, Ossicula, and 



Fenestrae, 536 



Functions of the Internal Ear 541 



Sensibility of the Auditory Nerve, ..... 543 



THE SENSE OF TASTE, 547 



THE SENSE OF TOUCH, 554 



CHAPTER XX. 



GENERATION AND DEVELOPMENT, ...... 559 



Generative Organs of the Female, 560 



Unimpregnated Ovum, ....... 563 



Discharge of the Ovum, ....... 567 



Corpus Luteum, 570 



