452 



Mesers. L. Hill and M. Greenwood, Jun. [Jan. 16, 



The next tables comprise all our results. The figures vertically beneath 

 one another refer to the same experiment : — 



Subject, M. G. 



Pressure. 



Alveolar percentages of CO ; . 







lbs. 



















5 '3, 5 4 



5 3 



5-5 



5-7 



5 -5, 5 -7 



5 -3, 5 -4 



8 



3 -3 (5 -06) 

 mean 













15 



2-3 (4 -6) 

 mean 



- 









2 -7 (5 -4) 



16 









2 -7 (5 -58) 



2 -7 (5 -58) 





22 







2 -1 (5 -18) 









30 







1 -8 (5 -4) 







1 -8 (5 -4) 



31 









1 -8 (5 -52) 



1 -8 (5 -52) 





45 











? 1 -3 (5 -2) 



46 











? 1 -3 (5 -3) 





60 













1 -0 (5 -0) 



61 











-9 (4 -6) 





75 













-9 (5 4) 



Subject, L. H. 



Positive 

 pressure. 



Alveolar percentages of CO. 



lbs. 

















5 -2, 5 -3, 4 9 



4 -9, 5 -0 



5-15 



4 -9, 5 -0 



4 -7, 5 -0 



4 



3 -5, 4 -0 (4 -8) 









9 





3 -35 (5 -35) 









18 





2 -5 (5 -48) 









23 





2 -1 (5 -3) 









17 







2 -5 (5 -3) 







31 





1 -85 (5 -7) 



1 -7 (5 -2) 







14J 









2 -5 (4 -9) 





30 









1 -65, 1 -7 (5 -0) 



1 -8 (5 -4) 



44£ 









1 -25, 1 -3 (5 -1) 





45 









1 -3 (5 -2) 



1 -2 (4 -8) 



52 









1 -1 (4 -9) 





60 









0-95,1 -0(4 -88) 



-9, -9 (4 -5) 



75 











-7, -8 (4 -5) 



15 











2 -5 (5 -0) 



We think these results show so close an agreement with the theoretical 

 values as to support the conclusion that changes in the percentage of carbon 

 dioxide in the alveolar air depend solely upon the physical conditions. No 

 increase or decrease in the pulmonary output of CO2 occurs. Metabolism, 

 then, in so far as it can be determined by an investigation of the alveolar air, 

 is not affected by increasing the barometric pressure. It is scarcely neces- 

 sary to add that this criterion is by no means adequate to sustain the final 

 conclusion that metabolism is, in fact, unaltered by the atmospheric condi- 



