Summary

William Addison Transactions of the Provincial Medical and Surgical Association (1836)

A rise in the dew-point, accompanied with a fall of the barometer, is an infallible indication that the whole mass of the atmosphere is becoming imbued with vapour, and a copious precipitation may be expected. If a fall in the barometer, and a fall in the temperature of the dew-point, take place at the same time, we may conclude that the expansion which occasions the former has arisen at some distant place, and wind, not rain, will be the result.
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William Addison Transactions of the Provincial Medical and Surgical Association (1836)

The hamlet of Malvern Wells, in the parish of Hanley Castle, is about two miles from Great Malvern; its situation is not quite so elevated, nor are the contiguous hills quite so high, but its local peculiarities are of the same character as those of Great Malvern: the water is equally, even if not more pure, and claims a longer period of celebrity. There are many delightful walks on the hills in the vicinity, and its quiet retirement, even in the height of the season, is preferred by many persons to the more bustling scenes at this time in Great Malvern.
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William Addison Transactions of the Provincial Medical and Surgical Association (1836)

Any natural process having a tendency to cool the air, so that its temperature falls to or below the dew-point, without originating any lateral motion to clear away the extraneous atmospheric impregnations which ensue, will contribute very much to concentrate them in the lower portions of the air.
Now this is the case with terrestrial radiation, which, with a clear and calm atmosphere, rapidly diminishes the temperature of certain parts of the earth's surface, and the circumambient air, condensing the vapour it contains, and creating a local, cold, damp, and very often malarious, atmosphere.
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