Decussation of motor and sensory fibres of spinal cord, 164 Dentition of infancy, 82 Diaphragm, Movements of the, in respiration, 128, 129 Diastole of the heart, 111 Diet, Mixed, 66, 85 Necessity for changing, 67 Necessity of a regulated, 62 The best, 63 Digestion, 80 Circumstances affecting, 97 Gastric, 93 Intestinal, 94 Nature of, 81 Organs of, 81-91 Drowning, 250 Duct, Biliary, 95 Nasal, 201 Pancreatic, 95 Thoracic, 97 Dura Mater, 152 E. Ear, 217 External, 217 Internal, 222 Middle, 219 Foreign bodies in, 225 Drum of the, 219 Bones of the, 220 Ear-sand, 223 Ear-stones, 223 Ear-wax, 219 Eggs, 68 Composition of, 68 Emulsion of fats, in digestion, 95 Enamel of the teeth, 82 Epiglottis, 126, 229 Uses of, 126, 220 Eustachian tube, 221 Exercise, 30 Different modes of, 31 Effects of, 30 Importance of, 30 Open-air, 33 Expiration, 128 Movements of, 129 Extensor muscles, 26 Eye, 198 Eyeball, 203 Eyelashes, 200 Eyelids, 200 F. Fats, 59 Emulsion of, 59 Source of, in food, 59 Fenestra ovalis, 224 Fibres, Muscular, 25 {267} Fibres, Nervous, 149 Fibrine in food, 58 of the blood, 102 Fish, as food, 71 Flexor muscles, 26 Food, 53 Animal, 67 Daily quantity of, 65 Ingredients of, 54-62 Necessity for, 64 Source of, 53 Vegetable, 71 G.