XX TABLE OF CONTENTS 



CHAPTER PAGE 



IV. STIMULANTS AND NARCOTICS 64 



I. Definitions ........ 64 



II. Beverages ........ 65 



III. Tobacco 75 



IV. Drugs and Patent Medicines .... 78 



V. DIGESTION AND ABSORPTION OF THE NUTRIENTS . . 82 



I. General Survey of the Digestive System . . 82 



II. Jfhe Mouth Cavity and its Functions . 84 



III. (Optional.) The Throat Cavity and Gullet 



and their Functions ..... 92 



IV. The Stomach and its Functions . . . .93 

 V. The Small Intestine and its Functions . .97 



VI. (Optional.) The Large Intestine and its Func- 

 tions 98 



VII. Absorption from the Alimentary Canal . . 98 



VIII. (Optional.) The Liver and its Functions . . 101 



IX. Hygiene of Digestion 102 



VI. CIRCULATION OF THE NUTRIENTS 107 



I. Composition of the Blood 107 



II. Circulation and its Organs 108 



III. The Heart .' . . . . . .109 



IV. The Blood Vessels . . . . . .112 



V. Circulation of the Blood . . . . .117 



VI. Hygiene of the Circulation . . . . .119 



VII. RESPIRATION AND THE PRODUCTION OF ENERGY IN 



MAN . 122 



I. Necessity for Respiration ...... 122 



II. Adaptations for securing Oxygen and for excreting 



Carbon Dioxid 124 



III. The Process of Breathing . . . . . .129 



IV. Hygiene of the Respiratory Organs .... 132 



