1881.] On the Influence of Altitude upon Respiration. 427 



the corresponding series. It is impossible to apply any correction for 

 temperature in the experiments made on the Col du Geant. The 

 mean temperature for each of us is not very dissimilar, being 41°* 7 in 

 one case and 43° °4 in the other. The excess of carbonic acid expired 

 at that station by M. David amounted to 28'6 per cent. 



These various percentages were alike in a remarkable degree, as will 

 be seen by placing them in a tabular form : — 



Excess of Carbonic Acid expired by M. David (after reduction for 

 Temperature.) 



At Yvoire. 



M. David's single 1 26*3 per cent, excess over my 1st series, 

 series / 27*9 2nd ,,. 



At Gourmayeur. 



1st series 2 7 "4 per cent, before ascending. 



2nd series 27*9 ,, after returning. 



On the Summit of the Got. 

 28*6 per cent. 

 Total means . 27*6 per cent. 



It may, therefore, be concluded that the mean excess of carbonic 

 acid expired at each station by M. David over that I gave out was 

 very nearly the same, and amounted to a mean of 27*6 per cent. 



One of the most interesting results of the present inquiry relates to 

 the volume of air expired per minute, and its relation to the carbonic 

 acid it was found to contain. This is shown in the following table: — 



Self 





M. David. 







Volume air '< 





Volume air 



Volume air (reduced) 



(reduced) 



Volume air (reduced) 



(reduced) 



expired per minute. 



expired for i 



expired per minute. 



expired for 





1 grm. C0 2 . 





1 grm. C0 2 . 





Litres. 





Litres. 



Yvoire (1,230 feet). 



Yvoire. 





1st Series 8 -04 



15 5 





13 7 



2nd Series 8 -39 



15 -4 





Courmayeur (3,945 feet). 



Courmayeur. 



Before ascending . 7 "05. . 



1 14 3 



Before ascending 10 '29 . 



14 2 



After returning . . 7 "07. . 



1 14-4 



After returning 11 "28 . 



15 5 



Summit of the Col (11,030 feet). 



Summit of the Col. 



5-82.. 



13 5 



7 -67. . 



12 6 



