*. The kind of atmosphere, according to Mead, most favourable to the propagation of pestilential fevers, is that which is hot, moist and calm.—But from recent observations, it appears, that the con|tagion of the yellow fever is most active in the month of Sep|tember▪ when the temperature of the air in the middle of the day, generally ranges between 60° and 80°, and is about 10° lower every morning and evening: This inequality in the tempe|rature rendering the human body exceedingly irritable, and liable to be affec••d, not only by contagion, but by marsh miasmata.

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