we
often hear of a host or hostess being unwell after a big function.
Their feelings on the morning after are often the reverse of "good-will
to men", and the cause is not a lowered moral heartiness but a weakened
physical body through breathing too much air exhaled from other
people's lungs. When man understands, he will make "good health" a
religious duty.

In connection with this I quote Dr. J. H. Kellogg, the eminent
physician and Superintendent of the Battle Creek Sanitarium. In his
book, "The Living Temple"[3], the doctor speaks as follows on the
importance of breathing pure air: "The purpose of breathing is to
obtain from the air a supply of oxygen, which the blood takes up and
carries to the tissues. Oxygen is one of the most essential of all the
materials required for the support of life.... The amount of oxygen
necessarily required for this purpose is about one and one-fourth cubic
inches for each breath.... In place of the one and one-fourth cubic
inches of oxygen taken into the blood, a cubic inch of carbonic acid
gas is given off, and along with it are thrown off various other still
more poisonous substances which find a natural exit through the lungs.
The amount of these combined poisons thrown off with a single breath is
sufficient to contaminate, and render unfit to breathe, three cubic
feet, or three-fourths of a barrel, of air. Counting an average of
twenty breaths a minute for children and adults, the amount of air
contaminated per minute would be three times twenty or sixty cubic
feet, or one cubic foot a second.... Every one should become
intelligent in relation to the matter of ventilation, and should
appreciate its importance. Vast and irreparable injury frequently
results from the confinement of several scores or hundreds of people in
a schoolroom, church, or lecture room, without adequate means of
removing the impurities thrown off from their lungs and bodies. The
same air being breathed over and over becomes densely charged with
poisons, which render the blood impure, lessen the bodily resistance,
and induce susceptibility to taking cold, and to infection with the
germs of pneumonia, consumption, and other infectious diseases, which
are always present in a very crowded audience room. Suppose, for
example, a thousand persons are seated in a room forty feet in width,
sixty in length, and fifteen in height: how long a time would elapse
before the air of such a room would become unfit