12 CONTENTS. 



CHAPTER XII. 



CHANGES WHICH THE AIE TJNDEEGOES IN EESPIEATION. 



General considerations Discovery of carbonic acid Discovery of oxygen Com- 

 position of the air Consumption of oxygen Influence of temperature In- 

 fluence of sleep Influence of an increased proportion of oxygen in the atmos- 

 phere Temperature of the expired air Exhalation of carbonic acid Influence 

 of age Influence of sex Influence of digestion Influence of diet Influence 

 of sleep Influence of muscular activity Influence of moisture and tem- 

 perature Influence of seasons Relations between the quantity of oxygen 

 consumed and the quantity of carbonic acid exhaled Exhalation of watery 

 vapor Exhalation of ammonia Exhalation of organic matter Exhalation 

 of nitrogen, Page 409 



CHAPTER XIII. 



CHANGES OF THE BLOOD IN EESPIEATION. 



Difference in color between arterial and venous blood Comparison of the gases 

 in venous and arterial blood Observations of Magnus Analysis of the blood 

 for gases Relative quantities of oxygen and carbonic acid in venous and ar- 

 terial blood Nitrogen of the blood Condition of the gases in the blood 

 Mechanism of the interchange of gases between the blood and the air in 

 the lungs General differences in the composition of arterial and venous 

 blood, 452 



CHAPTER XIV. 



EELATIONS OF EESPIEATION TO NUTEITION, ETC. 



Views of physiologists anterior to the time of Lavoisier Relations of the con- 

 sumption of oxygen to nutrition Relations of the exhalation of carbonic acid 

 to nutrition Essential processes of respiration The respiratory sense, or 

 want on the part of the system which induces the respiratory movements 

 Location of the respiratory sense in the general system Sense of suffocation 

 Respiratory efforts before birth Cutaneous respiration Asphyxia, . 472 



