Gall-bladder, 95 Ganglia, cranial, Functions of the, 171 Gases, Interchange of, in the lungs, 134 Gastric digestion, 93 Gastric juice, 91 Action of, 93 Daily quantity of, 92 General sensibility, 179 Glands, Perspiratory, 45 Salivary, 86 Sebaceous, 44 Glossary, 252 Glosso-pharyngeal nerve, 189 Gullet, 90 Gum, 61 as food, 62 Gustatory nerve, 189 Gymnastics, 33-38 for schools and colleges, 33 H. Hair, 42 Uses of, 44 Hearing, Sense of, 215 Protection of, 224 Heart, 107 Cavities of the, 109, 110 Circulation through the, 112 Frequency of action, 112 Movements of the, 111 Valves of the, 112 Heat, Animal, 143 Production of, 143 Regulation of, 145 Hemiplegia, 165 Humor, Aqueous, 210 Crystalline, 209 Vitreous, 210 Hunger, 65 Seat of the sensation of, 65 Hydra, 149 Hydrophobia, 169 Hygiene, 13 Hyperopia, 212 I. Incus, 220 Inorganic substances in food, 54 Insalivation, 86, 88 Insensible perspiration, 46 Inspiration, 128 Intestinal juice, 95 Action of, 96 Intestines, 94 Complete digestion in the small, 94 Villi of the, 96 Iris, 205 Function of, 205 Iron, 56 Proportion in the blood, 57 Proportion in the food, 57 J. Joints, 19 Varieties of, 20 Juice, gastric, 91 Intestinal, 95 Pancreatic, 95 L.