Studies on Lung Volume 



159 



put much stress on the middle capacity, the reserve and the com- 

 plementary air, on account of the uncertainty in the determina- 

 tion of these figures. 



The other figures are more important, and the relation of 

 4 — 3 — 1 of the total capacity, vital capacity, and residual air 

 may prove of value in future work. 



TABLE I 



Highest and lowest absolute values for lung volumes in 27 normal adults 

 arranged according to total capacity. 







Total 

 capacity. 



liter 

 7.82 

 4.84 



Middle 

 capacity. 



Residual 

 air. 



Vital 

 capacity. 



18 men 



maximum 



liter 

 4.89 

 3.09 



liter 

 1.97 

 1.34 



liter 

 5.85 

 3.50 





minimum 



9 women 



maximum 



4.83 



3.08 



2.91 

 1.88 



1.06 



0.881 



3.77 

 2.20 





minimum 



1 In two other women the residual air was 0.75 liter and 1.38 liter. 



TABLE II. 

 Relative values of different lung volumes. 



Authors. 



Bohr (1906) 



Rubow (1908).... 

 Lundsgaard and 



Van Slyke 



(1918) 



Present paper .... 



Material 



9 men 1 woman 

 8 women 



10 men 5 women 

 19 men 8 women 



Total I Middle 

 capacity, capacity. 

 M 



T !— X 100 



100 

 100 



100 

 100 



58.2 

 56.0 



58.8 

 62.0 



Residual . V ital 

 air. capacity. 



R V ■ 



— x ioo — x ioo 



16.3 



24.8 

 24.7 



76.8 

 73.7 



75.2 

 75.3 



TABLE III 



Mean error and mean error in per cent, of mean value of relative lung 



volumes. 





Number of 

 determinations. 



Mean value. 



Mean error 

 on each 

 determination. 



Mean error in 

 per cent, of 

 mean value. 



M 















T~ 



X 



100 



25 



62.0 



3.5 



5.6 



R 

 T~ 



X 



100 



27 



24.7 



4.0 



16.2 



