103 



viii TABLE OF CONTENTS. 



ART. SECT. PAGE 



40. VI. The natural distension of the Lungs. Inspi- 



ration. Expiration 91 



41. ,, How the Diaphragm descends . . . 96 



42. ,, The Chest is also enlarged by the movements 



of the Ribs and Sternum .... 98 



43. ,, Breathing an involuntary act . . . . .100 



44. „ Tidal air ; stationary air . . . .101 



VII. HOW THE BLOOD IS CHANGED 



BY FOOD : DIGESTION. 



45- »> Why the inside of the mouth is always red and 

 moist 



46. „ Why the Skin is sometimes moist. Sweat 



Glands 106 



47. „ The Mucous Membrane of the Alimentary 



Canal and its Glands . . . .109 



48. „ The Salivary Glands, Pancreas and Liver . 11 1 



49. ,, Food-stuffs 113 



50. ,, How proteids and starch are changed . . 115 



51. ,, Lacteals and Lymphatics . . . .117 



52. ,, What becomes of the Food-stuffs . . .120 



VIII. HOW THE BLOOD GETS RID OF 



WASTE MATTERS. 



53. „ The need of getting rid of Waste Matters . 123 



54. ,, The Kidneys get rid of Ammonia in the 



form of Urea 125 



55. IX. THE WHOLE STORY SHORTLY ^ 



TOLD. 127 



56. X. ^ HOW WE FEEL AND WILL 13a 



