Abstract
THE strange phenomena observed during a stay in high mountains attracted attention long before even the most elementary bases of respiratory physiology had been laid down by Lavoisier and Spallanzani. In the present age, in which airplanes take man easily to heights previously undreamed of, there is an infinitely greater interest in these problems. The conquerors of the highest of the earth's peaks have shown that man can become adapted to altitude conditions that would soon kill him if he were suddenly exposed to them. I cannot trace the historical aspects of this problem, which is surely among the most . . .

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