Experiences they have made, wherein their
Patients have miscarried, it is very easie to be perceiv'd, that they do
all along _hyperbolically extol_ their own Prescriptions, and vilifie those
of others. Notwithstanding all which, these kinds of Histories are
generally esteem'd useful, even to the ablest Physitian.

What may not be expected from the _rational_ or _deductive Faculty_ that
is furnisht with such _Materials_, and those so readily _adapted_, and
rang'd for use, that in a moment, at 'twere, thousands of Instances,
serving for the _illustration_, _determination_, or _invention_, of almost
any inquiry, may be _represented_ even to the sight? How neer the nature of
_Axioms_ must all those _Propositions_ be which are examin'd before so many
_Witnesses_? And how difficult will it be for any, though never so subtil
an error in Philosophy, to _scape_ from being discover'd, after it has
indur'd the _touch_, and so many other _tryals_?

What kind of mechanical way, and physical invention also is there requir'd
that might not this may be found out? The _Invention_ of a way to find the
_Longitude_ of places is easily perform'd, and that to as great
_perfection_ as is desir'd, or to at great an _accurateness_ as the
_Latitude_ of places can be found at Sea; and perhaps yet also to a greater
certainty then that has been hitherto found, as I shall very speedily
freely manifest to the world. The way of _flying_ in the Air seems
principally unpracticable, by reason of the _want of strength_ in _humane
muscles_; if therefore that could be suppli'd, it were, I think, easie to
make twenty contrivances to perform the office of _Wings_: What Attempts
also I have made for the supplying that Defect, and my successes therein,
which, I think, are wholly new, and not inconsiderable, I shall in another
place relate.

'Tis not unlikely also, but that _Chymists_, if they followed this method,
might find out their so much sought for _Alkahest_. What an _universal
Menstruum_, which dissolves all sorts of _Sulphureous Bodies_, I have
discover'd (which hat not been before taken notice of as such) I have shewn
in the sixteenth Observation.

What a prodigious variety of Inventions in _Anatomy_ has this latter Age
afforded, even in our own Bodies in the very _Heart_, by which we live, and
the Brain, which is the seat of our knowledge of other things? witness all
the excellent Works of _Pecquet_, _Bartholinus_, _Billius_, and many
others; and a