Within the last half century the whole community had been gradually
awakening to the importance of a knowledge of the laws of health, and
the energies of some of the ablest intellects in the world had been
employed in investigating the causes of disease, and in endeavoring to
solve the problem of the prevention of disease. There was much that was
still obscure in this very intricate problem, but the new light which
was daily being thrown upon the causes of disease by the careful and
exact researches of the chemist and physiologist was gradually tending
to explain those causes and to raise the science of hygiene, or science
of prevention of disease, out of the region of speculation, and enable
it to take rank as one of the exact sciences. Long ago the careful
observation of facts had shown that the preservation of health required
certain conditions to be observed in and around dwellings, conditions
which, when neglected, had led to the outbreaks of epidemic disease from
the days of Moses to the present time. But while the results had been
patent, it was only in recent years that a clew had been obtained to the
occult conditions in air and water to enable their comparative healthful
purity to be distinguished.
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