Nor has the recent history of the United States been less
fruitful in lessons. Yellow fever, which formerly swept not only
Southern cities but even New York and Philadelphia, has now been
almost entirely warded off. Such epidemics as that in Memphis a
few years since, and the immunity of the city from such
visitations since its sanitary condition was changed by Mr.
Waring, are a most striking object lesson to the whole country.
Cholera, which again and again swept the country, has ceased to
be feared by the public at large. Typhus fever, once so deadly,
is now rarely heard of. Curious is it to find that some of the
diseases which in the olden time swept off myriads on myriads in
every country, now cause fewer deaths than some diseases thought
of little account, and for the cure of which people therefore
rely, to their cost, on quackery instead of medical science.
This development of sanitary science and hygiene in the
United States has also been coincident with a marked change in
the attitude of the American pulpit as regards the theory of
disease.
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