CONTEXTS. IX 



PAGE 



THE CAPILLARIES 155 



The Structure and Arrangement of Capillaries . . . 156 

 Circulation in the Capillaries i6a 



THE VEINS 167 



Structure ib. 



Agents concerned in the Circulation of the Blood . . 173 



Velocity of Blood in the Veins 175 



Velocity of the Circulation 176 



PECULIARITIES OF THE CIRCULATION IN DIFFERENT PARTS 180 



Cerebral Circulation ib. 



Erectile Structures 183, 



CHAPTER VII. 



RESPIRATION 1 86 



Position and Structure of the Lungs ..... ib* 



Mechanism of Respiration . . . . . . 194 



Respiratory Movements 195 



Respiratory Rhythm ....... 200 



Respiratory Movements of Glottis ib. 



Quantity of Air respired . . . . . . 201 



Movements of the Blood in Respiratory Organs . . . 208 



Changes of the Air in Respiration 210 



Changes produced in the Blood by Respiration . . 219 



Mechanism of various Respiratory Actions . - . . 220 



Influence of the Nervous System in Respiration . . . 225 



Effects of the Suspension and Arrest of Respiration . . 227 



CHAPTER VIII. 



ANIMAL HEAT 231 



Variations in Temperature ...... 232 



Sources and Mode of Production of Heat in the Body . . 236 



Regulation of Temperature . ... . . . 238 



Influence of Nervous System 243 



