Canals, Semicircular, 223 Capillary blood-vessels, 118 Circulation in the, 118 Carbonic acid, 132 exhaled from the lungs, 132 in the air, 138 retention in the blood, 134 Cartilage, 20 Arytenoid, 229 Cricoid, 229 Thyroid, 229 Casein, 58 Cataract, 210 Cells, Nerve, 150, 159 Ciliated, 128 Cerebellum, 153 Function of the, 172 Cerebro-spinal nervous system, 150 Cerebrum, 152 Function of the, 172 Cheese, 58 Chest, Framework of, 19 Contents of the, 19 Chocolate, 77 Chorea, 169 Choroid coat of the eye, 204 Chyle, 95 Chyme, 94 Cilia, 128 Circulation, 107 in the frog's foot, 119 of the blood, 107 Rapidity of, 120 through the heart, 112 through the lungs, 123 Clothing, 51 Coagulation of milk, 58 of the blood, 104 Cochlea, 223 Coffee, 75 Effects of, 75, 76 Collar-bone, 19 Color-blindness, 209 Column, Spinal, 21 Combustion, Spontaneous, 145 Complexion, 44 Concha of the ear, 217 Conjunctiva, 200 Contraction of heart, 111 of muscles, 27 Convulsions, 169 Cooking, 70 Cords, Vocal, 126, 230 Cornea, 203 Corpuscles, Blood, 102 Cosmetics, 51 Cranial ganglia, 150 Functions of, 171 Cranial nerves, 154 Cranium, 19 Cricoid cartilage, 229 Crystalline lens, 209 Uses of, 210 Cuticle, 41 Function of, 183 Cutis, 42 D.