28o THE ENGINES OF THE HUMAN BODY 



Infection of wounds, 269, 273. 

 Infections favoured by cold, 158. 

 Inlet pipe, 11. 



valve, 11. 

 Insertion of muscles, 15. 

 Intellect, 239. 

 Intercostal muscles, 129. 

 Internal-combustion engine and muscle 

 compared, 29. 

 engine, model of, 5. 

 engine, reconstruction of, 10. 

 engine, respiratory chamber of, 133. 

 Internal secretion, glands of, 224. 



secretions, 75. 

 Interstitial gland, 224. 

 Intervertebral discs as buffers, 22. 

 Intestinal factory, 196. 



tailrace, 206. 

 Intestines (see Bowel). 

 Iris diaphragm mechanism, in. 



Jaw, lower, 165. 



upper, 165, 

 Jaws, alterations from use, 167. 



remodelling of, 166. 

 Jejunum, 202. 

 Jiu-jitsu, 51. 



Joint between skull and spine, 52. 

 Joints, anchylosis of, 87. 



construction of, 80. 



end organs of, 256. 



how they are guarded, 54. 



manipulation of, 270. 



of body, 82. 



wear of in disease, 87. 



Keith's experiment, 150. 

 Kidneys, function of, 201. 

 Knee-joint, displaced cartilages, 270. 



Labour, adaptations for, 68. 

 Lachrymal gland, 255. 

 Lacteals, 187, 204. 

 Laryngeal orifices, 136. 

 Larynx, 136. 



drawing of, 176. 

 Lavoisier, 150. 



Left ventricle (see Ventricle). 

 Leg, muscles in front of, 17. 

 Legs as wheels, 26. 

 Leucocytes or white corpuscles, 230. 

 Lever of first order, 48. 



lower jaw as, 166 



of second order, 57. 



of third order, 64. 

 Levers, formation of, 70. 



of skeleton, 47. 



of vertebra", 23. 

 Lewis, Dr Thomas, in. 

 Life, a form of combustion, 147. 

 Ligament, use of, 54. 

 Limbs, nerves to, 241. 

 Lipase, 198. 

 Liver, action of adrenalin on, it8. 



as source of heat, 152. 



Liver, functions of, 200. 



position of, 131. 



products of digestion to, 100. 



supposed function, 91. 

 Living matter not digested, 189. 

 Locomotion in man and beast, 19. 

 Locomotive system, weight of, 89. 

 Lower, Dr Robert, 148. 

 Lower limb, muscles of, 17. 



limbs compared to a wheel, 26. 

 Lubricant, formation of, 85. 

 Lubrication system, 80. 

 Lung, microscopic structure of, 139. 

 Lungs, area of living membrane, 140. 



capacity of, 140. 



circulation in, 102. 



discovery of function of, 147. 



expansion of, 144. 



nature of, 120. 



old conception of, 93. 



position of, 130. 



structure of, 137. 



supposed heat regulators, 147. 

 Lymph, 187, 



Lymphatics of stomach, 186. 

 Lymphoid tissue, 215. 



Macalister, Prof. A., 89. 

 Mackenzie, Sir James, 271. 

 Magendie, 247. 

 Malpighi, 105, 148. 

 Mandible (see Jaws). 

 Marie, Dr Pierre, 227. 

 Mass movements in colon, 209. 

 Mastication, 165. 



joints involved in, 82. 

 Mayow, Dr John, 148. 

 Medulla oblongata, 51, 237. 

 Medullary centres for heart, 114. 

 Metchnikoff. 216. 

 Microscope, use of, 105, 249. 

 Mill, jaws used as, 165. 

 Mind, effect of on digestion, 184. 

 Mitral valve, 103. 

 Motor centres of brain, 262. 

 Motor cortex or administrative areas, 239. 

 Motor cycle, alimentary canal of, 160, 

 196. 



and human body compared, 8, 26, 

 41, 118, 230, 268. 



circulation in, 118. 



co ordinating mechanism of, 220. 



defect of, 60. 



design of frame, 79. 



efficiency compared to that of body, 

 160. 



levers of, 47. 



mechanism of, 9. 



respiratory system of, 123, 133. 



suffocation of, 124. 



systems of lubrication, 81. 

 Motor functions of brain, 233. 



impulses, 257. 

 Mouth, 162. 

 Mouth-breathing, 136. 



