Ventilation and Oxygen in the Venous Blood of Man. 549 



collection ; 01 c.c. of 1-per-cent. sodium citrate solution having been placed 

 in the syringe to prevent clotting, the blood was drawn up exactly to the 

 1 c.c. mark. The analyses were made by means of the small Barcroft 

 apparatus — the oxygen being displaced by ferricyanide. 



The subject rested for some minutes on the couch, and at the time of 

 collection of the blood breathed through a meter so that ventilation of the 

 lungs was recorded. A mouthpiece was employed fitted with wide tubes 

 and mica inlet and outlet valves. The nose was closed with a clip. One 

 sample was collected while the subject breathed cpietly, and another from 

 the same, or the other arm, while he breathed forcibly. In the experiments 

 in which oxygen was breathed the subject inhaled from a large bag filled 

 with oxygen and exhaled through the meter. 



Double samples taken as controls under the same conditions gave us 

 results which agreed within fairly close limits. For example : — 



11"4 per cent., right arm; 120 per cent., left arm. 



Table I. — Cubic Centimetres of Oxygen per 100 c.c. of Blood. 







Resting. 





Working. 



Subject. 



Breathing 



Breathing 



Breathing 



Breathing 



Breathing 



Breathing 





air 



oxygen 



air 



oxygen 



air 



oxygen 





quietly. 



quietly. 



forcibly. 



forcibly. 



quietly. 



quietly. 



i 



12 y 



8 6 







5-5 



6 3 • 





5-9 



9-5 









3 2 



I 



7-6 



9-7 







6-8 



9 2 



4 



12 -7 



13-8 







7-0 



6-8 



5 



2 6 



5-0 







2-8 



4-7 



6 



14-0 



14 -6 







8-2 



7-3 



7 



10 -4 



8-5 





_ 



3 3 



1 -5 



8 



8-8 









6-5 





9 



11 -4 













10 



12 

 4-5 



11 1 





- 







11 



6 3 





13 -0 









12 



7-4 





14 -6 



- 







13 



7-5 





14-6 









14 





13 -7 





14-6 







15 





13 -2 





13 -8 







16 





12 "4 





12 -2 







17 





8-3 





9-2 







18 



8-3 



7-9 











19 





15 7 



11 -6 









20 





16-9 



15 2 









21 



13 4 



15 -6 











22 



9-1 



13 4 











23 



4-6 



7-0 











* 24 



14-1 



15 -4 











25 



16 •() 



17-9 











26 



8-6 



9-4 











27 



10 -8 



12 5 











2 u 2 



