NATURAL HISTORY OF SELBORNE. 201 
we see that water, by its coolness, is enabled to assimilate to itself 
a large quantity of moisture nightly by condensation ; and that the 
air, when loaded with fogs and vapours, and even with copious dews, 
can alone advance a considerable and never-failing resource. 
Persons that are much abroad, and travel early and late, such as 
shepherds, fishermen, &c., can tell what prodigious fogs prevail in 
the night on elevated downs, even in the hottest parts of summer ; 
and how much the surfaces of things are drenched by those 
swimming vapours, though, to the senses, all the while, little 
moisture seems to fall. 
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