228 



H. M. JOHNSON AND FRANKLIN C. PASCHAL 



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On mjrhmer'v'l . air.C.lC." Flj<*ed b^.l^jLSWj' O, * itart Sjl nniih_J-.4- 



Lct<a4 Q,% _._.^p u)w --Rftp in decil per mm Syti. B. P 



Duu. B. P. F*ulse Proiure Accoen. in mm. Convergence in mm. 



pB>cholu^:cfcl 



July 7, 1919. No. 6924, major, Medical Corps, twenty-nine, married, flight 

 surgeon, non-flyer. 



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

 ing which the oxygen was replenished as consumed. 



Very slow but very accurate, reaching level quite early. An initial effect, in 

 the form of retardation appeared in the 17th and 18th minutes, but was over- 

 come until 11 per cent oxygen was reached. At this point a controlled 

 drop in diastolic blood pressure began. Compensation then took the form of 

 increased effort and owing to the type of the early performance, this was more 

 than sufficient to overcome the deteriorating effects of low oxygen, with the 

 result that his performance was higher at the end of the run than at any previous 

 time. He was taken off by the clinician when making his best performance 

 because of a sudden drop in the diastolic blood pressure, which indicated that 

 circulatory failure was impending. 



