Contribution to the Physiology of Respiration under the Arctic Climate. 105 



On the other hand, there does not seem to be any constant 

 relation between the variations in the total volume respired and the 

 fluctuations in the air-pressure. 



The alveolar carbonic acid tension does not show such 

 simple and uniform conditions in this series as in the control series. 



If we take the 12 experiments together (experiment 30 being 

 excluded, as also 34, in which the gas-analysis is wanting), the per- 

 centage of carbonic acid is on the average 4-32 + 0025, ц = 0129 

 or 30 ^Iq of the average. Expressed in mm. of mercury, the average 

 is 30-9 ± 0-22, fji = 115 or 37 Wo of the average. 



Group I, which here only embraces 5 cases, gives for the aver- 

 age 436 4: 0033, fji = 0109 or in mm. of mercury, the average is 

 31-3 + 0-309, JUL = 103. For group II, the average is 428 4r 0034, 

 // = 0-13; in mm. of mercury 306 ± 029 and /^ = 114. 



We thus find a higher alveolar carbonic acid tension on the 

 cold days than on the days with ordinary temperatures; but the 

 two groups are not sharply separated. Just as a gradual adaptation 

 to the cold could be noticed in the total volume of air respired, 

 we can see the same thing here, when we consider the deviations 

 in group I. The carbonic acid tension falls in the first four experi- 

 ments, then rises again in the isolated experiment No. 42. The 

 deviations from the average are. 



-I- 11 



4-0-4 



+ 0-7 



— 1-8 



— 0-4 



This series is however obviously disturbed by the variations in 

 the air-pressure. Thus, if we consider the deviations in the separate 

 experiments of the whole series, we find : 



— 0-2 Bar. 774 

 -f 1-5 771-5 

 + 0-8 770-5 

 + 11 769-0 



— 1-4 756 



— 1-5 752 

 4- 0-3 752 



— 1-3 750 



— 1-5 760 

 -f 0-4 766 

 + 1-8 770 

 4-0 758 



