viii CONTEXTS. 



THE BLOOD, continued. 



Conditions affecting Coagulation 66 



Chemical Composition of the Blood .... 68 



The Blood-Corpuscles, or Blood-Cells 69 



Chemical Composition of Eed Blood-Cells ... 74 



Blood-Crystals $. 



The White Corpuscles 7 6 



The Serum 7$ 



Variations in the Principal Constituents of the Liquor 



Sanguinis 79 



Variations in Healthy Blood under Different Circumstances 83 

 Variations in the Composition of the Blood in Different 



parts of the Body 84 



Gases contained in the Blood 89 



Development of the Blood 90 



Uses of the Blood 95 



Uses of the various Constituents of the Blood ib. 



CHAPTER VI. 



CIRCULATION OF THE BLOOD . .... 99 



The Systemic, Pulmonary, and Portal Circulation . . IOL 



THE HEART 102 



Structure of the Valves of the Heart . . . . 104 



The Action of the Heart . . . . . . . 109 



Function of the Valves of the Heart . . . . 112 



Sounds of the Heart . . . 119 



Impulse of the Heart . . ..... 122 



Frequency and Force of the Heart's Action . . . 124 



Cause of the Rhythmic Action of the Heart . . . 128 



Effects of the Heart's Action 132 



THE ARTERIES . . ' 133 



Structure of the Arteries ib. 



The Pulse 143 



Sphygmograph . 146 



Force of the Blood in the Arteries 152 



Velocity of the Blood in the Arteries 155 



