1by the Diggers, that even when the Sky
ſeem'd clear, there would not ſeldom ſud
denly ariſe, and ſometimes long continue,
a certain Steam (which they uſually call a
damp) ſo groſs and thick, that it would
oftentimes put out their very Candles, if
they did not ſeaſonably prevent it. And
I think it will eaſily be granted, that the
aſcenſion of ſuch Steams into this or that
part of the Air, and their mixing with it,
are very like to thicken it; as on the o
ther ſide either heat or the ſudden conden
ſation of the Air in another part of the At
moſphere (to mention now no other cau
ſes) are capable of rarifying it.
ſeem'd clear, there would not ſeldom ſud
denly ariſe, and ſometimes long continue,
a certain Steam (which they uſually call a
damp) ſo groſs and thick, that it would
oftentimes put out their very Candles, if
they did not ſeaſonably prevent it. And
I think it will eaſily be granted, that the
aſcenſion of ſuch Steams into this or that
part of the Air, and their mixing with it,
are very like to thicken it; as on the o
ther ſide either heat or the ſudden conden
ſation of the Air in another part of the At
moſphere (to mention now no other cau
ſes) are capable of rarifying it.
Nor will it very much import the main
ſcope of our Diſcourſe, whether it be
ſuppoſ'd that the copious Steams the
earth ſends into the air, thicken that part
of the Atmoſphere that receives them,
and make it more heavy: Or that ſome
times the Fumes may aſcend with ſuch ce
lerity, that though the Air be thicken'd
yet they rather diminiſh then encreaſe its
gravitation, in regard that the quickneſs
of their aſcent, not onely keeps them
from gravitating themſelves, but may
hinder the preſſing downwards of many
Aërial Corpuſcles that they meet with in
ſcope of our Diſcourſe, whether it be
ſuppoſ'd that the copious Steams the
earth ſends into the air, thicken that part
of the Atmoſphere that receives them,
and make it more heavy: Or that ſome
times the Fumes may aſcend with ſuch ce
lerity, that though the Air be thicken'd
yet they rather diminiſh then encreaſe its
gravitation, in regard that the quickneſs
of their aſcent, not onely keeps them
from gravitating themſelves, but may
hinder the preſſing downwards of many
Aërial Corpuſcles that they meet with in