. MAP OF MOUNT EVEREST AND THE SURROUNDING DISTRICT. Reproduced by kind permission of the Royal Gco^taphicat Society. indicated 23,000 ft. as the altitude above which oxygen would always be required. It was also found that even at great heights climbers who are deprived of the use of oxygen, whether by accident or exhaustion of supply, do not suffer anv great harm. Mr. Finch, however.

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