EFFECTS OF DEPKIVATION OF OXYGEN 



203 



A.S.. Pilot. Casual 



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March 24, 1919. No. 6653, second lieutenant, Air Service, twenty-four, single, 

 mechanic, 1 year high school. 



One hundred hours flying, maximal altitude 18,000 feet for 10 minutes. 



Physical condition good. 



Initial performance only fair, due to slowness; few errors; slight disturbance 

 when mouthpiece was inserted. Considerable improvement from practice 

 during first half of test. Deterioration due to impaired muscular coordination, 

 resulting in slowness; began at 21st to 22d minute between 10 and 11 per cent 

 Oa. Greatly increased effort. Hard pressure with pencil from 21st minute 

 very tremulous at 26th. Unable to form letters after 27 minutes 13 seconds. 



