CONTENTS IX 



CHAPTER XIV 



PAGE 



PHYSIOLOGY OF NERVE . . . . . . . .143 



Classification of Nerves . . . . . . .143 



Investigation of Nerve Functions . . . . . .146 



Degeneration of Nerve . . . . . . .146 



Regeneration of Nerve ....... 148 



Roots of the Spinal Nerves . . . . . .155 



Changes in Nerve during Activity . . . . . .158 



Velocity of a Nerve Impulse. . . . . . .159 



Direction of a Nerve Impulse ..... 160 



Crossing of Nerves . . . . . . . .161 



The Nature of the Nerve Impulse . . . . . . 163 



Receptive Substances . . . . . . ,164 



Chemistry of Nervous Tissues ...... 165 



CHAPTER XV 



ELECTROTONUS . . . . . . . . .169 



CHAPTER XVI 



NERVE CENTRES ......... 180 



Structure of Nerve-Cells 182 



The Law of Axipetal Conduction . . . . . .191 



The Significance of Nissl's Granules . . . . .192 



Classification of Nerve-Cells according to their Function . . .194 



CHAPTER XVII 



THE AUTONOMIC NERVOUS SYSTEM . . . . . .196 



CHAPTER XVIII 

 TROPHIC NERVES ......... 206 



CHAPTER XIX 



THE CIRCULATORY SYSTEM ....... 208 



The Heart 208 



Course of the Circulation ....... 214 



Structure of Arteries ...... .216 



Structure of Veins . . . . . . . .218 



Structure of Capillaries and Sinusoids ..... 222 



Structure of Lymphatic Vessels . . . . . .223 



CHAPTER XX 



THE CIRCULATION or THE BLOOD ...... 227 



