Atmospheric pressure is to the body what the governor is to
the steam engine, or the pendulum to the clock. It regulates
vital action, insures safety and lessens the wear and tear of
machinery. Under its soothing influence the number of
respirations per minute are diminished, the heart beats decreased
in frequency, and the tired brain and nerves rested. It is often
better than medicine, and will sometimes give relief when all
other means fail.

Arizona has a diversity of altitudes, and therefore furnishes a
variety of climates. The elevations range from about sea level
at Yuma to nearly thirteen thousand feet upon the San Francisco
mountains. By making suitable changes in altitude to fit the
season it is possible to enjoy perpetual spring.

Because Arizona is far south geographically it is only natural to
suppose that it is all very hot, which is a mistake. In the low
valleys of southern Arizona the summers are hot, but it is a dry
heat which is not oppressive, and the winters are delightfully
pleasant. In northern Arizona the winters are cold and the
summers cool. There is no finer summer climate in the world than
is found on the high plateaus and pine-topped mountains of
northern Arizona. Prescott, Williams and Flagstaff have a
charming summer climate, while at Yuma, Phoenix and Tucson the
winter weather is simply perfect.

A mountain residence is not desirable for thin, nervous people or
such as are afflicted with any organic disease. A high altitude
is too stimulating for this class of patients and tends to
increase nervousness and aggravates organic disease. Such