But though I could not with my _Microscope_, nor with my breath, nor any
other way I have yet try'd, discover a passage out of one of those cavities
into another, yet I cannot thence conclude, that therefore there are none
such, by which the _Succus nutritius_, or appropriate juices of Vegetables,
may pass through them; for, in several of those Vegetables, whil'st green,
I have with my _Microscope_, plainly enough discover'd these Cells or Poles
fill'd with juices, and by degrees sweating them out; as I have also
observed in green Wood all those long _Microscopical_ pores which appear in
Charcoal perfectly empty of any thing but Air.
Now, though I have with great diligence endeavoured to find whether there
be any such thing in those _Microscopical_ pores of Wood or Piths, as the
_Valves_ in the heart, veins, and other passages of Animals, that open and
give passage to the contain'd fluid juices one way, and shut themselves,
and impede the passage of such liquors back again, yet have I not hitherto
been able to say any thing positive in it; though, me thinks, it seems very
probable, that Nature has in these passages, as well as in those of Animal
bodies, very many appropriated Instruments and contrivances, whereby to
bring her designs and end to pass, which 'tis not improbable, but that some
diligent Observer, if help'd with better _Microscopes_, may in time detect.
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