EFFECTS OF DEPRIVATION OF OXYGEN 



219 



T ;T . ...... RetreatMng 



.. ccnd. at time of !t- 



Dost. B. P Pulse Pressure Accom. in mm. 



_rw-r>_ Paycholociea 



TIME IX XD.-UTC3 



May 8, 1919. No. 6876, second lieutenant, pilot, thirty, single, electrical 

 engineer. 



Three hundred and fifty hours flying, all overseas, no crashes or combats, 

 24,000 feet for 20 minutes. 



Physical condition good. Run was preceded by 5 minutes' rebreathing dur- 

 ing which the oxygen was replenished as consumed. 



This work was quite rapid and accurate, with an initial impairment coinci- 

 dent with a fall in diastolic blood pressure at 19 minutes and the final deterio- 

 ration began at 23 minutes accompanied by another fall in the diastolic. A sudden 

 break in the latter caused the clinician to take him off just before complete ineffi- 

 ciency was reached but not until he had shown a distinct deterioration in speed 

 and legibility and had made many errors and repetitions. 



