CONTENTS. XVii 



PAGE 



2. Of Muscular Irritability - - - 439 



3. Of Muscular Tonicity - 449 



4. Energy and Rapidity of Muscular Contraction 452 



CHAPTER VIII. 



OF THE VOICE AND SPEECH. 



1. The Larynx, and its Actions - - 455 



2. Of Articulate Sounds - - - 464 



CHAPTER IX. 



INFLUENCE OF THE NERVOUS SYSTEM ON THE ORGANIC FUNCTIONS. 470 



CHAPTER X. 



OF FOOD AND THE DIGESTIVE PROCESS. 



1. Sources of the Demand for Aliment. Hunger and Thirst 477 



2. Nature and Destination of the Food of Animals 483 



3. Of the Passage of Food along the Alimentary Canal - 492 



Mastication and Deglutition - 494 



Action of the Stomach - 496 



Action of the Intestinal Tube - 501 



Act of Defecation - 502 



4. Nature of Chymification and Chylification 503 



CHAPTER XI. 



OF ABSORPTION AND SANGUIFICATION. 



1. Absorption from the Digestive Cavity - 509 



2. Absorption from the Body in general - 512 



3. Of the Elaboration of the Nutrient Materials 517 



4. Composition and Properties of the Chyle and Lymph - 523 



5. Physical and Vital Properties of the Blood 527 



6. Pathological Changes in the Blood 535 



CHAPTER XII. 



OF THE CIRCULATION OF BLOOD. 



1. Of the Circulation in General - 540 



2. Action of the Heart 546 



3. Movement of the Blood in the Arteries and Capillaries 556 



4. Of the Venous Circulation 566 



5. Peculiarities of the Circulation in different Parts 568 



CHAPTER XIII. 



OF RESPIRATION. 



1 . Nature of the Function ; and Provisions for its Performance - 



2. Effects of Respiration on the Air 



2* 



