* * * * *
Observ. VI. _Of Small Glass Canes._
That I might be satisfied, whether it were not possible to make an
_Artificial_ pore as _small_ as any _Natural_ I had yet found, I made
several attemps with small _glass pipes_, melted in the flame of a Lamp,
and then very _suddenly_ drawn out into a great length. And, by _that
means_, without much difficulty, I was able to draw some almost as small as
a _Cobweb_, which yet, with the _Microscope_, I could plainly perceive[7]
to be _perforated_, both by looking on the _ends_ of it, and by looking on
it _against the light_ which was much the _easier way_ to determine whether
it were solid or perforated; for, taking a small pipe of glass, and closing
one end of it, then filling it _half full_ of water, and holding it
_against the light_, I could, by this means, very easily find what was the
_differing aspect_ of a _solid_ and a _perforated_ piece of glass; and so
easily distingish, without seeing either end, whether any _Cylinder_ of
glass I look'd on, were a _solid stick_, or a _hollow cane_. And by this
means, I could also presently judge of any small _filament_ of glass,
whether it were _hollow_ or _not_, which would have been exceeding tedious
to examine by looking on the end. And many such like ways I was fain to
make use of, in the examining of divers other particulars related in this
Book, which would have been no easie task to have determined meerly by the
more common way of looking on, or viewing the Object.
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