An essay concerning the effects of air on human bodies / By John Arbuthnot.

  • John Arbuthnot
Date:
1733
Catalogue details

Licence: Public Domain Mark

Credit: An essay concerning the effects of air on human bodies / By John Arbuthnot. Source: Wellcome Collection.

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    Clouds, which, when their Weight can¬ not be any more fuftain’d by the Air, fall down in a thin Rain; and thefe Particles, by falling from greater Heights, unite, and form great Drops of Rain; and when frozen by the extreme Cold- nefs of the Air, Snow and Hail; but the Manner of Generation of thefe Fruits of the Air, is foreign to my prefent Sub- jedt. When by the Weight of the Air the Vapours afeend higheft, and arc moft intimately mix’d with the Air, the lower Region in which we breathe may be faid to be dry in refpedi: to human Bodies. VIL Dew is another Ingredient of Air. Dew is not mere Water, but a Compofition of all the watery, volatile, oily, faline Vapours, which exhale from the Earth, which, as long as they arc agitated by the Sun, are not to be feen, but as foon as the Air cools, they be¬ come vifible. The Air being a rare Bo¬ dy, cools much fooner than the Earth, which continues ftill to fweat out this Subftance after the Sun is down; and by the Cold of the Night a great deal of it falls down again in the Form of Water; for you may obferve, when there is no Wind, there is always to be feen a Goat of this Vapour near the Sur-
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