Points from Foregoing Letters

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    THE content of oxygen by volume at high altitudes, obtained by means of registering balloons with a new device for air sampling, is found by Prof. E. Regener to decrease from 2049 per cent at 14 km. to 20-4 per cent at 28 km. At heights above 20 km. there are relatively great variations in composition, due probably to weather conditions.

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