(T0)
Beams that enter'd the Little hole,and by the
Darkness having lts Pupill much Enlarg'd, I
eould discern that theseMotes as soon as they
came within the compass of the Luminous,
whether Cylinder or Inverted Cone, ifI
may fo call it, that was made up by the Unclouded Beams of the Sun , did in certain
positions appear adorn'd with very vivid Colours, like those of the Rain-bow, or rather
like those of very Minute,but Sparkling fragments of Diamonds ; and as soon as the
Continuance of their Motion had brought
them to anInconvenient position in reference
to the Light and the Eye, they were only
visible without Darting any lively Colours
as before, which seems to argue that these
little Motes,or minute Fragments,of several
forts ofbodies reputed Opacous, and only
crumbled as to their Exteriour and Foofer
parts into Dust, did nor barely Reflect the
Beams that fell upon them, but remit them
to the Eye Refracted too. We may also observe, that several Bodies, (as well some of
a Vegetable,^ others ofan Animal nature)
which are wont to pass for Opacous, appear
in great part Transparent, when they are
reduc'd into Thin parts, and held against a
powerful Light. This I have not only taken
notice ofin pieces of Fvory reduc'd but into
Thick heaves, as alSo in divers considerable
Thick
