Studies on Lung Volume 



157 



TABLE II. 



Relations between amount of air left in lungs after expiration, depth of 

 respiration and number of respirations in experiment giving full mixture 

 of lung air with hydrogen in two normal individuals. 



Amount of air left in- 

 side lungs after ex- 

 piration (residual air 

 plus more or less of 



vital capacity). Depth of respirations 



liter liter 



(a) Rebreathing from a Krogh spirometer. 



6.35 1.5 14 



5.85 



( 1.5 13 

 } 2.0 7 



r 1.5 io 



4.85 ] 2.0 7 

 [3.0 6 



3.85 



f 1.5 6 

 I 2.0 6 

 | 3.0 5 

 L 4.0 4 



2.85 



1.5 6 

 2.0 5 

 3.0 5 

 4.0 4 

 5.0 3 



2.00 



1.0 9 

 1.5 6 

 2.0 4 

 3.0 3 

 4.0 3 

 5.0 3 



(b) Rebreathing from five-liter rubber bag. 



2.00 



1.0 6 

 1.5 5 

 2.0 3 

 2.5 3 

 3.0 3 



1.30 



1.0 7 

 1.5 5 

 2.0 3 

 2.5 3 

 3.0 3 



Number of respirations 

 necessary for secur- 

 ing full mixture. 



