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49
hours a day in the public sewers of a city, and is
never attacked by any serious disease. Numbers of
persons live daily amongst the most inconceivable
abominations of filth and self-neglect, and yet
have comparatively good health. It is very clear,
therefore, that some persons do not suffer from
the action of these poisons. We cannot always
account for this, but this fact we know, that
persons who have had certain forms of contagious
disease do not have the same forms after. Thus
those who have had Scarlet Fever or Small Pox
do not as a rule have it again. In this way we
can appoint persons to attend the sick from any
particular disease, who have had that disease and
will not take it again. We say they have no
predisposition to take the disease. Now one of the
greatest preventions of one of these contagious
diseases, Small Pox, was discovered by Jenner.
He found that persons might have a modified form
of Small Pox called Cow Pox imparted to them
which would prevent their being predisposed to take
Small Pox.
This is probably one of the greatest discoveries
ever made by the ingenuity of man, and has saved
more lives than all other discoveries put together.
If such a discovery could be made for every other
kind of contagious disease it would be the means of
putting an end altogether to the dire brood of
contagions. Unfortunately all people do not believe
in Jenner's discovery, and neglecting to be vaccinated
Small Pox rages amongst them as though Jenner s