to believe that pilots in the higher altitude ranges may in some 

 circumstances hyperventilate to such an extent as to bring on 

 tetany and even loss of consciousness. 



Thus the pendulum swings; and if we wish to gain perspective 

 for tomorrow, we look to the past and to the work of men like 

 Robert Boyle, Paul Bert and Angelo Mosso who give us courage 

 and inspiration to face the future. 



John F. Fulton. 

 Yale University, 

 August 15, 1943. 



IX 



