ORGANIC CHEMISTRY 79 Carbon 81 Inorganic Carbon Compounds 83 Carbon Dioxid 83 Relation of Carbon Dioxid to Life 85 Carbon Monoxid 86 Organic Carbon Compounds 87 Classification of Organic Carbon Compounds: _a_ Hydrocarbons 89 _b_ Alcohols 91 _c_ Glycerin 92 _d_ Aldehydes and Ethers 93 _e_ Organic Acids 94 Organic Nitrogenous Compounds 99 _Lesson IV_ CHEMISTRY OF FOODS 103 Carbohydrates 107 Classification of Carbohydrates 108 _a_ Monosaccharids 109 _b_ Disaccharids 112 _c_ Polysaccharids 114 Fats and Oils 122 Proteids or Nitrogenous Food Substances 125 Mineral Salts in Food 131 _Lesson V_ CHEMISTRY OF DIGESTION 135 Digestive Organs and Digestive Juices 137 Saliva 142 Gastric Juice 144 Composition of the Gastric Juice 147 Bile 153 Pancreatic Juice 153 Intestinal Juices 157 The Secretion of Digestive Juices 158 Abnormal Chemical Changes in the Digestive Organs 165 The Decomposition of Food 173 Digestive Experiments 175 Mechanics of Digestion 180 The Muscular Movement of Digestive Organs 187 _Lesson VI_