THE RESPIRATORY SYSTEM. 

 A B 



271 



FIG. 104. Blood-pressure tracing. (Mathison.) 

 A shows the effect of asphyxia ; B shows the effect of breathing pure nitrogen. 



SJLO - 



"!" 



f + 



ck&t&c 



f ae* % 



FIG. 105. Blood-pressuie tracing. (Mathison.) 



A shows the effect of excess of C0 2 in inspired air ; B shows the effect of injecting 

 lactic acid into the circulation. 



