156 



Scientific Proceedings (127) 



varied from 1.35 liters to 6.35 liters. Similarly the depth of the 

 respirations, kept constant during an experiment, could be varied 

 regularly from one experiment to another. The whole range 

 was from 1 to 5 liters. The third factor, the number of respira- 

 tions was varied from 2 to 16. At the end of each experiment 

 the subject expired to the maximum extent and samples were 

 drawn (1) from the bag, and (2) from alveolar air. Accord- 

 ing to previous investigations a higher hydrogen percentage in 

 the alveoli than in the bag was taken as a proof of full mixture. 

 Table I is an example of one series of 110 experiments. Table II 

 gives all the results in a concentrated form. 



TABLE I. 



Example of experiments. Complete mixture is present if b — or > a. 











Hydrogen 















in sample 



Hydrogen 



Difference 





Amount of 







from 



in sample 



between 



Experi- 



air left in 



Depth of 



Number of 



spirometer 



from 



two 



ment 



lungs after 



respira- 



respira- 



(or bag). 



alveolar air. 



samples. 



namber. 



expiration. 



tions. 



tions. 



a 



b 



b — a 





liters 



liters 





per cent. 



per cent. 





1 



4.85 



1.5 



9 



11.97 



11.90 



—0.07 



2 



4.85 



1.5 



10 



6.32 



6.36 



-fO.04 



3 



4.85 



2.0 



6 



7.50 



7.43 



—0.07 



4 



4.85 



2.0 



7 



9.28 



9.29 



-fO.Ol 



5 



4.85 



3.0 



4 



9.54 



9.48 



—0.06 



6 



4.85 



3.0 



5 



11.06 



11.00 



—0.06 



7 



4.85 



3.0 



6 



10.82 



10.82 



±0.00 



8 



3.85 



1.5 



5 



15.25 



14.90 



—0.35 



9 



3.85 



1.5 



6 



11.51 



11.51 



±0.00 



10 



3.85 



1.5 



7 



16.01 



16.03 



-fO.02 



11 



3.85 



2.0 



5 



9.12 



8.91 



0.21 



12 



3.85 



2.0 



6 



13.15 



13.17 



-fO.02 



13 



3.85 



3.0 



4 



10.15 



10.05 



—0.10 



14 



3.85 



3.0 



5 



10.60 



10.60 



±0.00 



15 



3.85 



4.0 



2 



10.47 



10.13 



—0.34 



16 



3.85 



4.0 



3 



12.94 



12.91 



—0.03 



17 



3.85 



4.0 



4 



10.29 



10.30 



-fO.Ol 



18 



3.85 



4.0 



5 



16.52 



16.52 



±0.00 



