CONTEN1S. xiii 



CHAPTER XXV. 



THE CHEMISTRY OF RESPIRATION. , 



PAGE 



Nature of the problems. Changes produced in air by being once 

 breathed. Ventilation. Changes undergone by blood in the 

 lungs. The blood gases. Causes of color of arterial and 

 venous blood. Laws governing the absorption of gases by 

 liquids. The absorption of oxygen by the blood. Conse 

 quences of the way in which oxygen is held in the blood. 

 The general oxygen interchanges of the blood. The carbon 

 dioxide of the blood. Internal respiration 372 



CHAPTER XXVI. 



THE NERVOUS FACTORS OF THE RESPIRATORY MECHANISM. 

 ASPHYXIA. 



The respiratory centre. Is the respiratory centre reflex? The 

 stimulus of the respiratory centre. The cause of the respira- 

 tory rhythm. The influence of the pneumogastric nerves upon 

 the respiratory centre. The expiratory centre. Asphyxia. 

 Carbon monoxide haemoglobin. Modified respiratory move- 

 ments 390 



CHAPTER XXVII. 



THE KIDNEYS AND THE SKIN. 



The general arrangement of the urinary organs. The structure 

 of the kidneys. The renal secretion. The mechanism of the 

 renal secretion. The function of the renal epithelium. The 

 skin. Epidermis and cutis vera. Hairs. Nails. Glands of 

 the skin. Relation of nerves to sweat secretion. Hygiene of 

 the skin. Bathing 404 



CHAPTER XXVIII. 



NUTRITION. 



The problems of animal nutrition. The seat of the oxidations of 

 the Body. Tissue-building and energy-yielding foods. The 

 source of the energy spent in muscular work. Luxus con- 

 sumption. The antecedents of urea. Proteid starvation and 



