Now, the common preventives against infection are such as are
peculiarly inimical to every kind of insect; camphor, chloride of
lime, tobacco-smoke, and powerful scents and smokes of any kind.
The first impulse on the appearance of an infectious disease is
to purify everything as much as possible, and by extra
cleanliness and fumigations to endeavor to arrest its progress.
The great purifier of Nature is a violent wind, which usually
terminates an epidemic immediately; this would naturally carry
before it all insect life with which the atmosphere might be
impregnated, and the disease disappears at the same moment. It
will he well remembered that the plague of locusts inflicted upon
Pharaoh was relieved in the same manner: "And the Lord turned a
mighty strong west wind, which took away the locusts and cast
them into the Red Sea; there remained not one locust in all the
coasts of Egypt."
Every person is aware that unwholesome air is quite poisonous to
the human system as impure water; and seeing that the noxious
qualities of the latter are caused by animalcules, and that the
method used for purifying infected air are those most generally
destructive to insect life, it is not irrational to conclude that
the poisonous qualities of bad water and bad air arise from the
same cause.
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