viii CONTENTS. 



I'AGK 



Circulation of Blood in the \Yel> of the Frog's Foot. Blood Mow in 

 the Capillaries. The Veins. The Valves in the Veins. F.t'fect of 

 Pressure on the Veins. Rate of Blood Flow. Nourishment of the 

 Walls of the Heart. Effect of Gravity on Circulation. 



CHAPTER V. 



CONTROL OF CIRCULATION. THE BLOOD AND THE LYMPH .... 64 

 The Effect of Emotions on Circulation. Rhythmic Action of the 

 Heart. Nerve Control of the Heart. Sympathetic Nervous System. 

 The Vagus Nerve. Inhibition. Vaso-motor Nerves. Blushing. 

 Regulation of the Size of the Arteries. Effect of Exercise on the 

 Size of the Arteries. Effects of Alcohol on Circulation. The 

 Bloocl. The Corpuscles of the Blood. The Plasma. Hemoglobin. 

 Coagulation of Blood. Fibrin. Amount of Blood. Distribution of 

 Blood. The Lymph Spaces. Lymph Tubes. Lymphatic Glands. 

 Flow of Lymph. Massage. Transfusion of Blood. 



CHAPTER VI. 



RESPIRATION 84 



The Close Relation between Circulation and Respiration. Organs 

 of Respiration. Structure of the Lungs. The Windpipe. Cilia. 

 The Pleura. The Diaphragm. Action of the Diaphragm. Move- 

 ments of Respiration. Forces of Inspiration. Resistances to Inspi- 

 ration. Elastic Reactions of Expiration. Forced Respiration. Rate 

 of Respiration. Modifications of Respiration. Lung Capacity. 

 Hygiene of Respiration. Breathing through the Mouth. Control 

 of Respiration. Chemistry of Respiration. Composition of the 

 Air. Exchanges between the Air and the Blood in the Lungs. 

 Oxyhemoglobin. The Gases in the Blood. Production of Heat 

 and Motion in the Body. Oxidation of Live Tissues. Body and 

 Locomotive Compared. Storage of Oxygen in the Tissues. Re- 

 breathing Air. 



CHAPTER VII. 



VENTILATION AND HEATING. DIST AND BACTERIA 114 



Need of Ventilation. Grates. Principles of Ventilation. Stoves. 

 Furnaces. Foul-air Shafts and Fans. Steam and Hot-water 

 Heating. Direct and Indirect Heating. Dead Dust. Sources of 

 Dust. Live Dust. Consumption. Disease Germs. Bacteria. How 

 to avoid Dust. Sweeping. Contagious Diseases. Putrefaction. 

 Preservation of Foods. Need of Removal of Waste. 



