The effect of heat upon the body is measured by the difference in
the actual and sensible temperatures, as recorded by the dry and
wet bulb thermometers. When both stand nearly together as they
are apt to do in a humid atmosphere, the heat becomes
insufferable. In the dry climate of Arizona such a condition
cannot occur. The difference in the two instruments is always
great, often as much as forty degrees. For this reason, a
temperature of 118 degrees F. at Yuma is less oppressive than 98
degrees F. is in New York. A low relative humidity gives comfort
and freedom from sunstroke even when the thermometer registers
the shade temperature in three figures.
A dry, warm climate is a stimulant to the cutaneous function.
The skin is an important excreting organ that is furnished with a
large number of sweat glands which are for the dual purpose of
furnishing moisture for cooling the body by evaporation and the
elimination of worn out and waste material from the organism. As
an organ it is not easily injured by over work, but readily lends
its function in an emergency in any effort to relieve other tired
or diseased organs of the body. By vicarious action the skin is
capable of performing much extra labor without injury to itself
and can be harnessed temporarily for the relief of some vital
part which has become crippled until its function can be
restored.
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