Xll CONTENTS. 



CHAPTER XVII. 



PAGE 



NEEVE-CENTRES 188 



Structure of Nerve-Cells 191 



The Significance of Nissl's Granules 200 



CHAPTER XV111. 



THE CIRCULATORY SYSTEM 203 



The Heart 203 



Course of the Circulation 211 



Arteries 213 



Veins 215 



Capillaries 219 



Lymphatic Vessels 222 



CHAPTER XIX. 



THE CIRCULATION OF THE BLOOD 226 



CHAPTER XX. 



PHYSIOLOGY OF THE HEART 231 



The Cardiac Cycle 231 



Action of the Valves of the Heart 233 



Sounds of the Heart . 235 



Coronary Arteries 238 



Cardiographs 238 



Endocardiac Pressure 241 



Frequency and Force of the Heart's Action 245 



Innervation of the Heart ........ 247 



Instruments for studying the excised Frog's Heart . . . . 258 



CHAPTER XXI. 



THE CIRCULATION IN THE BLOOD-VESSELS i6i 



Velocity of the Blood-Flow 261 



Use of the Elasticity of the Vessels 266 



The Pulse 267 



Capillary Flow 273 



Venous Flow 276 



Local Peculiarities of the Circulation 277 



Blood-pressure 281 



Measurement of Blood-pressure in Man 295 



Vaso-motor Nervous System 296 



