The causes of “ altitude sickness ” are enumerated and discussed, and a definition is given of the limits within which pure oxygen or mixtures of air and oxygen may be breathed at various heights, with the symptoms and effects produced. The usefulness of the pressure‐cabin and the requirements which it must satisfy are also considered. Ear troubles occurring in flight, and the risk of embolism in rapid ascents, are discussed, together with their causes, and the possibility of eliminating these troubles is examined.
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