u6 



RESPIRATION 



should relieve the symptoms in CO poisoning : for the increased 

 CO 2 pressure will enable the oxygen to come off more easily from 

 the oxyhaemoglobin present in the blood, and will thus tend to 

 relieve the anoxaemia. The circulation rate will also be increased, 

 as will appear in Chapter X. There would seem to be a considerable 

 future scope for the therapeutic use of CO 2 in anoxaemic condi- 





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2 OFF 



Figure 37. 



Tracing i. (Stethograph) Douglas, July 12. Evening of arrival on Pike's Peak. Natural 

 periodic breathing. 



Tracing 2. Haldane, July 12. Evening of arrival. Natural periodic breathing with more 

 sharply defined periods after making six forced breaths. 



Tracing 3. July 16, Haldane. Natural periodic breathing abolished by administration of 

 oxygen. Reappearance of periodic breathing after withdrawing the oxygen. 



tions of all kinds, whether or not these conditions are due to im- 

 perfect oxygenation of the arterial blood. 



Even when simple anoxaemia is so extreme that consciousness 

 is on the point of being lost, the breathing in man, except at first, 

 is hardly more than doubled, as shown by the fact that the alveolar 



