Abstract
LESS than fifty years ago serious doubts were voiced that man could survive a night spent at 20,000 feet, or climb above 23,000 feet. Each decade has pushed this limit higher and higher until now, with the highest mountains on earth climbed, it is known that well acclimatized men can reach 28,250 feet without supplementary oxygen, and can probably climb even to the summit of the earth, 29,140 feet, breathing only the ambient air. But one should note the word "acclimatized" — it is crucial. For if a man were taken suddenly to the summit of Everest from sea level . . .
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