TRAVELS  IN  THE AIP
 

this no further break occurred in the regular increase of temperature,
the sky being clear till the descent was completed. From the general
agreement of the results as observed by Eegnault's hygrometer, and
those of the dew-point as found by the dry and wet bulb thermo¬
meters, there can be no doubt that the temperature of the dew-
point, at heights exceeding 30,000 feet, must have been as low as
minus 50° below the zero of Fahrenheit's scale, or 82° below the
freezing-point of water, implying that the air was very dry.
 

THE   PIGEONS.