EFFECTS OF DEPRIVATION OF OXYGEN 



209 



May 11, 1919. No. 6874, second lieutenant, pilot, twenty-three, single, clerk. 



One hundred hours flying, 30 overseas, none over lines. One crash from 

 forced landing. 



Physical condition good but slept poorly the night before. 



Run was preceded by 5 minutes' rebreathing during which the oxygen was 

 replenished as consumed. 



A rapid improvement over the initial performance with a decided drop when 

 mouthpiece was introduced. There was a steady improvement up to the 13th 

 minute, at which time a very high speed was attained. From this point, coin- 

 cident with a rise in pulse rate and pulse pressure, there was a drop to the level 

 of the previous sets and after the 18th minute a rapid decline of both speed and 

 accuracy. At 26:25 he had become inefficient through deterioration of both 

 attention and muscular coordination. 



