x CONTENTS. 



PAQF 



THE BLOOD, continued. 



Variations in Healthy Blood under Different Circumstances 91 

 Variations in the Composition of the Blood in Different 



Parts of the Body . . . . . . , . 93 



Gases contained in the Blood . . . . . . . . 98 



Blood-Crystals .. .. .. .. .. ib. 



Development of the Blood . . . . . . . . 100 



Uses of the Blood . . . . . . . . . . 106 



Uses of the various Constituents of the Blood . . . . ib. 



CHAPTER VI. (continued.} 



CIRCULATION OF THE BLOOD . . . . . . . . 109 



The Systemic, Pulmonary, and Portal Circulations . . no 



THE HEART .. .. .. .. .. .. 112 



The Action of the Heart . . . . . . . . 119 



Function of the Valves of the Heart . . . . . . 122 



Sounds of the Heart .. .. .. .. 129 



Impulse of the Heart . . . . . . . . 132 



Frequency and Force of the Heart's Action .. .. 134 



Cause of the Rhythmic Action of the Heart ... . . 138 



Effects of the Heart's Action. . . . . . . . 142 



THE ARTERIES . . . . . . . . . . 143 



The Pulse.. .. .. .. .. .. 155 



Force of the Blood in the Arteries . . . . . . 164 



Velocity of the Blood in the Arteries . . . . . . 167 



THE CAPILLARIES . . . . . . . . . . ib. 



The Size, Number, and Arrangement of Capillaries . . 169 



Circulation in the Capillaries .. .. .. .. 172 



THE VEINS .. .. .. .. .. .. 178 



Agents concerned in the Circulation of the Blood . . 183 



Velocity of Blood in the Veins . . . . . . 186 



Velocity of the Circulation . . . . . . . . 187 



PECULIARITIES OF THE CIRCULATION IN DIFFERENT PARTS 191 



Cerebral Circulation . . . . . . . . ib. 



Erectile Structures . . . . . . . . . . 194 



CHAPTER VII. 



RESPIRATION . . . . . . . , . . . . 197 



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



Mechanism of Respiration . . . . . . . . 204 



Respiratory Movements . . . . . . . . 206 



Respiratory Rhythm .. .. .. .. 210 



