No person not a native of a marshy country should travel overland in the evening; dew causes a strong action in vapours, mists, &c. Invalids and soldiers after fatigue, should halt in the daytime, and march in the evening, to avoid being chilled.
Note 9.
A sure remedy against the malaria of ditches, ponds, &c., is to fill the water-courses with water; never suffer them to be so far dried up that the spawn of living creatures may attach itself to the sides of grass, bushes, &c., and afterwards to dry and spread about like the seeds of flowers, in the environs. The mud which is left exposed to the air gives out, on drying, various gases, which being mixed with the fossils of the mud, contaminate the air, and are breathed by the people in the neighbourhood.
A circular drain, having a double current, well understood by the hydraulic engineers of Holland, is the kind of drain I prefer.
THE END.
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