VI CONTENTS. 



PAGE 



THE HEART, .......... 97 



Structure of the Heart and its Valves, . . . . 97 



STRUCTURE OP THE ARTERIES, CAPILLARIES, AND VEINS, . . . 105 



Physiology of the Heart, . . . . . . . 115 



Physiology of the Arteries, . . . . . . .134 



Physiology of the Capillaries, .... .153 



Physiology of the Veins, . . . . . . .156 



VELOCITY OF THE CIRCULATION, . . . . . .158 



Velocity of the Blood in the Arteries, . . . . . .159 



Capillaries, ..... 160 



Veins, . . . . . .160 



Velocity of the Circulation as a whole, . . . . . 161 



PECULIARITIES OP THE CIRCULATION IN DIFFERENT PARTS, . . .162 



Circulation in the Brain, . . . . . . . 162 



Circulation in the Erectile Structures, . . . . . .163 



Agents concerned in the Circulation, . . . . . 165 



Discovery of the Circulation, . . . . . . .165 



Proofs of the Circulation of the Blood, 165 



CHAPTEE V. 



RESPIRATION, . . . . . . . . .167 



Position and Structure of the Lungs, . . . . .168 



'Structure of the Trachea and Bronchial Tubes, . . . .170 



Structure of the Lungs and Pleura, . . . . .174 



Mechanism of Respiration, . . . . , . .178 



Respiratory Movements, . . . . . . .179 



Quantity of Air respired, ....... 184 



Vital or Respiratory Capacity, . . . . . .184 



Force exerted in Respiration, . . . . . . . . 186 



Changes of the Air in Respiration, . . . . . .187 



Changes produced in the Blood by Respiration, .... 193 



Mechanism of various Respiratory Actions, .... 193 



Influence of the Nervous System in Respiration, .... 197 



Effects of Vitiated Air Ventilation, ..... 199 



Effect of Respiration on the Circulation, . . . .200 



Apnoea Dyspnoea Asphyxia, ...... 204 



CHAPTER VI. 



FOOD AND DIET, ......... 208 



Classification of Foods, ....... 209 



Foods containing chiefly Nitrogenous Bodies, .... 210 



Carbohydrate Bodies, . 212 

 " Fatty Bodies, ... .213 



Substances supplying the Salts, ..... 213 



Liquid Food, 213 



