CONTENTS. Vll 



PAGE 



THE VEINS, 141 



Structure, 141 



Agents concerned in the Circulation of the Blood, . . 145 



Velocity of Blood in the Veins, 147 



Velocity of the Circulation, 147 



PECULIARITIES OF THE CIRCULATION IN DIFFERENT PARTS, 150 



Cerebral Circulation, 150 



Erectile Structures, 152 



CHAPTEE VII. 



RESPIRATION, , 155 



Position and Structure of the Lungs, ; 155 



Mechanism of Eespiration, ....... 161 



Respiratory Movements, ...;... 162 



Kespiratory Khythm, 165 



Kespiratory Movements of Glottis, 166 



Quantity of Air respired, ....... 166 



Movements of the Blood in Respiratory Orgaiis, . . . 172 



Changes of the Air in Respiration, ..... 173 



Changes produced in the Blood by Respiration, . . . 179 



Mechanism of various Respiratory Actions, . . . 180 



Influence of the Nervous System in Respiration, . . . 185 



Effects of the Suspension and Arrest of Respiration, . . 186 



CHAPTER VIII. 



ANIMAL HEAT, . . . . . . . . . . . 189 



Variations in Temperature, ....... 190 



Sources and Mode of Production of Heat in the Body, . 192 



Regulation of Temperature, ....... 194 



Influence of Nervous System, ...... 198 



CHAPTER IX. 



DIGESTION, 199 



Food, 199 



Starvation, . . 203 



