EFFECTS OF DEPRIVATION OF OXYGEN 



221 



Type o( BaLre.thlny 



May 14, 1919. No. 6878, first lieutenant, observer, thirty-four, married, 

 stock broker. 



One hundred hours flying, 30 hours over lines, 3 combats, 2 credits, was shot 

 down; 18,000 feet for 2 hours. 



Physical condition good. Run was preceded by 13 minutes' rebreathing dur- 

 ing which the oxygen was replenished as consumed. 



Mouthpiece in place at start. A steady increase in speed was shown during 

 the first 13 minutes of the run, when a steady decline began. He was taken off 

 at 23:32 by the clinician when both the systolic and diastolic blood pressures 

 fell. While accuracy was still fair, a fall in the rate of substitution had accom- 

 panied the fall in blood pressure. 



