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. Of these there are a multitude in the substance of the Coal,
every where almost perforating and drilling it from end to end; by means of
which, be the Coal never so long, you may easily blow through it; and this
you may presently find, by wetting one end of it with Spittle, and blowing
at the other.

But this is not all, for besides those many great and conspicuous irregular
spots or pores, if a better _Microscope_ be made use of, there will appear
an infinite company of exceedingly small, and very regular pores, so thick
and so orderly set, and so close to one another, that they leave very
little room or space between them to be fill'd with a solid body, for the
apparent _interstitia_ or separating sides of these pores seem so thin in
some places, that the texture of a Honey-comb cannot be more porous. Though
this be not every where so, the intercurrent partitions in some places
being very much thicker in proportion to the holes.

Most of these small pores seem'd to be pretty round, and were rang'd in
rows that radiated from the pith to the bark; they all of them seem'd to be
continued open pores, running the whole length of the Stick; and that they
were all perforated, I try'd by breaking off a very thin sliver of the Coal
cross-ways, and then with my _Microscope_, diligently surveying them
against the light, for by that means I was able to see quite through them.

These pores were so exceeding small and thick, that in a line of them, 1/18
part of an Inch long, I found by numbring them no less then 150. small
pores; and therefore in a line of them an Inch long, must be no less then
2700. pores, and in a circular _area_ of an Inch diameter, must be about
5725350. of the like pores; so that a Stick of an Inch Diameter, may