1count my ſelf, in paying of a duty to
you, to have done a piece of Service to
the Commonwealth of Learning. Since
it may highly conduce to the advance
ment of that Experimental Philoſophy,
the effectual purſuit of which, requires
as well a Purſe as a Brain, to endeere it
to hopeful Perſons of your Quality: who
may accompliſh many things which o
thers can but wiſh or, at moſt, but deſign,
by being able to imploy the Preſents of
Fortune in the ſearch of the Myſteries of
Nature.
you, to have done a piece of Service to
the Commonwealth of Learning. Since
it may highly conduce to the advance
ment of that Experimental Philoſophy,
the effectual purſuit of which, requires
as well a Purſe as a Brain, to endeere it
to hopeful Perſons of your Quality: who
may accompliſh many things which o
thers can but wiſh or, at moſt, but deſign,
by being able to imploy the Preſents of
Fortune in the ſearch of the Myſteries of
Nature.
And I am not faintly induc'd to make
choice of this Subject, rather then any
of the expected Chymical ones, to enter
tain your Lordſhip upon, by theſe two
Conſiderations: The one, That the Ayr
being ſo neceſſary to humane Life, that
not onely the generality of Men, but
moſt other Creatures that breath, can
not live many minutes without it; any
conſiderable diſcovery of its Nature,
ſeems likely to prove of moment to
Man-kinde. And the other is, That the
Ambient Ayr, being that whereto both
our own Bodies, and moſt of the others
we deal with here below, are almoſt per
petually contiguous; not onely its alte-
choice of this Subject, rather then any
of the expected Chymical ones, to enter
tain your Lordſhip upon, by theſe two
Conſiderations: The one, That the Ayr
being ſo neceſſary to humane Life, that
not onely the generality of Men, but
moſt other Creatures that breath, can
not live many minutes without it; any
conſiderable diſcovery of its Nature,
ſeems likely to prove of moment to
Man-kinde. And the other is, That the
Ambient Ayr, being that whereto both
our own Bodies, and moſt of the others
we deal with here below, are almoſt per
petually contiguous; not onely its alte-