1certain conſiſtence of Air requiſite to Re
ſpiration; ſo that if it be too thick, and
already over-charged with vapors, it will
be unfit to unite with, and carry off thoſe
of the Blood, as Water will diſſolve, and
aſſociate to it ſelf but a certain proportion
of ſaline Corpuſcles; and if it be too
thin or rarefied, the number or ſize of the
Aërial Particles is too ſmall to be able to
aſſume and carry off the halituous Excre
ments of the Blood, in ſuch plenty as is
requiſite.
ſpiration; ſo that if it be too thick, and
already over-charged with vapors, it will
be unfit to unite with, and carry off thoſe
of the Blood, as Water will diſſolve, and
aſſociate to it ſelf but a certain proportion
of ſaline Corpuſcles; and if it be too
thin or rarefied, the number or ſize of the
Aërial Particles is too ſmall to be able to
aſſume and carry off the halituous Excre
ments of the Blood, in ſuch plenty as is
requiſite.
Now that Air too much thicken'd (and
as it were clogg'd) with Steams, is unfit
for Reſpiration, may appear by what is
wont to happen in the Lead-Mines of De
vonſhire, (and, for ought I know, in thoſe
too of other Countrys, though I have
ſeen Mines where no ſuch thing was com
plain'd of) for I have been inform'd by
more then one credible Perſon (and parti
cularly by an Ingenious Man, that has of
ten, for curioſity, digg'd in thoſe Mines,
and been imploy'd about them) that there
often riſes Damps, as retaining the Ger
mane Word by which they call them)
which does ſo thicken the Air, that unleſs
the Work-men ſpeedily make ſigns to
them that are above, they would (which
as it were clogg'd) with Steams, is unfit
for Reſpiration, may appear by what is
wont to happen in the Lead-Mines of De
vonſhire, (and, for ought I know, in thoſe
too of other Countrys, though I have
ſeen Mines where no ſuch thing was com
plain'd of) for I have been inform'd by
more then one credible Perſon (and parti
cularly by an Ingenious Man, that has of
ten, for curioſity, digg'd in thoſe Mines,
and been imploy'd about them) that there
often riſes Damps, as retaining the Ger
mane Word by which they call them)
which does ſo thicken the Air, that unleſs
the Work-men ſpeedily make ſigns to
them that are above, they would (which