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3. That it is always imported into this
country from an infected district, and
generally from Holland or the ports of the
Baltic.
4. That the visitation is not preceded by
any remarkable condition of the atmosphere;
for although in the epidemics of 1832, 1848,
1854, the weather was warm, the barometric
pressure high, the air stagnant with prevalent
mists, and there was but little rain, yet in
the visitation of 1866, the condition of the
weather was almost exactly the reverse of
this—for the barometer was generally low,
the season was cold, the atmosphere was
constantly in motion, with frequent gales,
and there was much rain.
5. That although the disease is of tropical
growth, and is generally most severe in its
manifestations during the summer and
autumn heat, yet it is not always checked by
the cold of winter. The epidemic of 1830
was terribly fatal at Moscow during the
winter of that year. The same was also the
case at Berlin in 1832; and the epidemic of
1849 was at its height in Glasgow, Paisley,
and other towns of Scotland in the middle
of winter; so also in the epidemics of 1854