CONTENTS xiil 



CHAPTER VIII 

 A STUDY OF THE CIRCULATION OF BLOOD 



PAGE 



Definition of the Circulation Organs of Circulation . . . 129 



1. THE HEART : Position, Shape, Size The Pericardium 



The Heart a Double Organ The Cavities of the Right and 

 Left Hearts The Valves of the Right and Left Hearts 

 The Blood Vessels connected with the Right Heart The 

 Semilunar Valves The Blood Vessels connected with 

 the Left Heart The Beat of the Heart The Action of 

 the Valves of the Heart Sounds of the Heart The Blood 

 Supply for the Heart .129 



2. THE BLOOD VESSELS: Position of Arteries and the Pulse 



Structure of Arteries Position of the Veins The Struc- 

 ture of Veins Position of the Capillaries Importance of 

 the Capillaries Structure of the Capillaries Flow of 

 Blood in the Web of a Frog's Foot Absence of Pulse in 

 Capillaries and Veins . . . . . . . . 137 



3. THE CIRCULATION OF THE BLOOD : The Two So-called Sys- 



tems of Circulation The Pulmonary Circulation The 

 Systemic Arteries The Systemic Veins The Portal 

 System of Veins The Circulation but a Single System 

 Changes in the Composition of Blood Inappropriateness 

 of the Terms "Arterial" and "Venous" Regulation of 

 the Blood Supply to the Various Organs .... 142 



4. THE LYMPHATIC SYSTEM: The Lymph Changes in the 



Lymph The Lymphatics The Lacteals . . . .148 



5. HYGIENE OF THE CIRCULATORY SYSTEM : Effect of Heat and 



Cold on the Arteries Colds and their Prevention Effect 

 of Exercise on the Heart Effect of Exercise on the Size 

 of the Blood Vessels Treatment of Cuts and Bruises 

 Effect of Alcohol on Organs of Circulation .... 151 



6. A COMPARATIVE STUDY OF THIS CIRCULATION: Circulation 



in the Earthworm Circulation in the Fish Circulation 

 in the Frog Circulation in the Reptiles Circulation in 

 the Birds and Mammals Comparison of the Organs of 

 Circulation Studied 154 



