Nor will it be enough for a Defendant of
that _Hypothesis_, to say, that perhaps it is because the refractions have
made the Rays more weak, for if so, then two refractions in the two
parallel sides of a _Quadrangular Prisme_ would produce colours, but we
have no such _Phaenomena_ produc'd.
There are several Arguments that I could bring to evince that there are in
all transparent bodies such atomical pores. And that there is such a fluid
body as I am arguing for, which is the _medium_, or Instrument, by which
the pulse of Light is convey'd from the _lucid body_ to the enlightn'd. But
that it being a digression from the Observations I was recording, about the
Pores of _Kettering Stone_, it would be too much such, if I should protract
it too long; and therefore I shall proceed to the next _Observation_.
* * * * *
Observ. XVI. _Of _Charcoal_, or burnt _Vegetables_._
Charcoal, or a Vegetable burnt black, affords an object no less pleasant
than instructive, for if you take a small round Charcoal, and break it
short with your fingers, you may perceive it to break with a very smooth
and sleek surface, almost like the surface of black sealing Wax; this
surface, if it be look'd on with an ordinary _Microscope_, does manifest
abundance of those pores which are also visible to the eye in many kinds of
_Wood_, rang'd round the pith, both a in kind of circular order, and a
radiant one.
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