Boyle, Robert, New experiments physico-mechanicall, touching the spring of the air and its effects, 1660

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1ſpicuous interval betwixt ſuch Diſcourſes,
and the Experiments whereunto they belong,
or are annexed; that they who deſire onely
the Hiſtorical part of the account we give
of our Engine, may read the Narra­
tives, without being put to the trouble
of reading the Reflections too: Which I
here take notice of, for the ſake of thoſe
that are well verſ'd in the New Philoſophy,
and in the Mathematicks; that ſuch
may skip what was deſign'd, but for ſuch
Perſons as may be leſs acquainted even then
I, with matters of this nature (ſcarce ſo
much as mention'd by any Writer in our
Language) and not for them from whom
I ſhall be much more forward to learn, then
to pretend to teach them.
Of my being
wont to ſpeak rather doubtfully, or heſitant­
ly, then reſolvedly, concerning matters
wherein I apprehend ſome difficulty, I have
in another Treatiſe (which may, through
Gods Aſsiſtance, come abroad ere long)
given a particular, and I hope a ſatisfacto­
ry account: Wherefore I ſhall now defend
my Practice but by the Obſervation of Ari­
ſtotle, who ſomewhere notes, That to ſeem
to know all things certainly, and to ſpeak
poſitively of them, is a trick of bold and
yong Fellows: Whereas thoſe that are in-

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