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9209. YELLOW FEVER, Origin.—

appear to have established that it is originated
here by a local atmosphere, which is never gen
erated but in the lower, closer, and dirtier parts
of our large cities, and in the neighborhood of
the water; and that, to catch the disease, you
must enter the local atmosphere. Persons having
taken the disease in the infected quarter,
and going into the country, are nursed and
buried by their friends, without an example
of communicating it. * * * It is certainly
an epidemic, not a contagious disease.—
To C. F. Volney. Washington ed. iv, 570.
(W. 1805)