550 Messrs. J. F. Twort and L. Hill. Pulmonary 



Considering the slight physiological differences which may arise, e.g., from 

 posture, exposure to cold during the collection of samples, etc., we cannot 

 expect to get closer results. To carry out work the subject grasped a spring 

 ergograph and squeezed it 20 times a minute ; the sample was collected 

 immediately at the end of two minutes period of work. 



The average of 22 analyses taken when resting and breathing air quietly 

 is 9'5 per cent., breathing oxygen quietly 1T8 per cent. 



The average of analyses when working and breathing air quietly is 

 5*7 per cent., while that when working and breathing oxygen quietly 

 is 5"6 per cent. The corresponding resting analyses in the same subjects 

 gave 9"4 per cent, when breathing air quietly, 10 - per cent, when breathing 

 oxygen quietly. 



Table II. — Effect of Warming One Arm. 



Subject. 



Arm not warmed. 



Arm warmed with batb. 



Remarks. 





per cent. 



per cent. 





1 



9-4 



14-8 



Air quietly breathed. 



2 



4-3 



11 -7 





3 



10 -o 



11 -6 



)) )> 

 Oxygen quietly breathed. 



4 



10-3 



12 -2 



5 



12 -6 



14 -2 



Air forcibly breathed. 





15 -2 



16-4 



Oxygen breathed quietly. 



The average of the six experiments is 10"3 per cent, for the unwarmed 

 and 13 - 5 per cent, for the warmed arm. 



Table III. — Effect of Forcibly Breathing Air or Oxygen. 



Subject. 



Forcibly breathing air. 



Forcibly breathing oxygen. 





per cent. 



per cent. 



1 



14 '2 



14-8 



2 



11 3 



11 -8 



3 



13-5 



13 -1 



4 



12-9 



12 "4 



5 



9-2 



9-8 



6 



17 -1 



16 -8 



7 



14-1 



14 -1 



8 



14-2 



16-0 



9 



11 -6 





10 



15 -2 





11 



13-0 





12 



14-6 





13 



14 6 





The average of 13 analyses of samples taken when forcibly breathing air 

 is 13*5 per cent., and of eight breathing oxygen forcibly 13'6 per cent. 

 To sum up, then, the average results of the analyses are : — 



