10 CONTENTS. 



CHAPTER III. 



PAGE 



GENEEAL FEATUKES OF NERVOUS TISSUES 122 



CHAPTER IV. 

 THE VASCULAR MECHANISM. 



The Structure and Main Features of the Vascular Apparatus . . 133 



The Structure of Arteries, Capillaries, and Veins 134 



The Main Features of the Apparatus . . . 134 



The Main Facts of the Circulation 136 



Hydraulic Principles of the Circulation 144 



Circumstances Determining the Kate of the Flow 150 



The Heart 157 



The Phenomena of the Normal Beat 157 



Endocardiac Pressure 164 



Summary 174 



The Work Done 175 



The Pulse ... 176 



The Regulation and Adaptation of the Vascular Mechanism : The Regulation of 



the Beat of the Heart 191 



The Development of the Normal Beat 192 



The Government of Heart-beat by the Nervous System 199 



Other Influences Regulating or Modifying the Beat of the Heart 209 



Changes in the Calibre of the Minute Arteries. Vasomotor' Actions 211 



The Course of Vaso-constrictor and Vaso-dilator Fibres 219 



The Effects of Vasomotor Actions 221 



Vasomotor Functions of the Central Nervous System 222 



The Capillary Circulation 231 



Changes in the Quantity of Blood 236 



A Review of Some of the Features of the Circulation . 238 



BOOK II. 



THE TISSUES OF CHEMICAL ACTION WITH THEIR RESPECTIVE 

 MECHANISMS. NUTRITION. 



CHAPTER I. 

 THE TISSUES AND MECHANISMS OF DIGESTION. 



The Characters and Properties of Saliva and Gastric Juice : Saliva 246 



Gastric Juice 251 



The Act of Secretion of Saliva and Gastric Juice and the Nervous Mechanisms 



which Regulate It . ... 260 



The Changes in a Gland Constituting the Act of Secretion 



The Properties and Characters of Bile, Pancreatic Juice, and Succus Entericus . . 278 



Bile. 278 



