Xll CONTENTS 



CHAPTER XVII 



PAGE 



NEUVE CENTRES ......... 190 



Structure of Nerve-Cells . . . . . . .192 



The Significance of Nissl's Granules ..... 200 



Classification of Nerve-Cells ....... 203 



Law of Axipetal Conduction ..... 204 



CHAPTER XVIII 



THE CIRCULATORY SYSTEM . ...... 206 



The Heart ......... 206 



Course of the Circulation . . . . . .213 



Arteries ......... 214 



Veins ......... 216 



Capillaries ........ 219 



Lymphatic Vessels ....... 221 



CHAPTER XIX 



THE CIRCULATION OF THE BLOOD ...... 226 



CHAPTER XX 



PHYSIOLOGY or THE HEART . . . . . . .231 



The Cardiac Cycle . . . . . . . .231 



Action of the Valves of the Heart ... ... 233 



Sounds of the Heart ........ 234 



Coronary Arteries ........ 237 



Cardiographs ......... 237 



Intracardiac Pressure . . . . . . .240 



Frequency of the Heart's Action ...... 244 



Work of the Heart ..... .244 



Innervation of the Heart . . . . . . 247 



The Excised Heart . . . . . . . .252 



CHAPTER XXI 



THE CIRCULATION IN THE BLOOD-VESSELS ..... 259 



Use of the Elasticity of the Vessels .261 



Blood-pressure ........ 263 



Velocity of the Blood-Flow . . . . . . .278 



The Time of a Complete Circulation . . . . .285 



The Pulse 287 



The Capillary Flow . 293 



The Venous Flow ........ 296 



The Vaso-motor Nervous System . . . . . .297 



Plethysmography ........ 307 



Pathological Conditions ....... 310 



Local Peculiarities of the Circulation . . . . 311 



