)
_EXPERIMENT IX._
We took a Leaf of Such Foliated Gold as Apothecaries are wont to Gild their
Pills with; and with the Edge of a Knife, (lightly moysten'd by drawing it
over the Surface of the Tongue, and afterwards) laid upon the edge of the
Gold Leaf; we so fasten'd it to the Knife, that being held against the
light, it conctinu'd extended like a little Flagg. This Leaf being held
very near the Eye, and obverted to the Light, appear'd so full of Pores,
that it seem'd to have such a kind of Transparency as that of a Sive, or a
piece of Cyprus, or a Love-Hood; but the Light that pass'd by these Pores
was in its Passages So Temper'd with Shadow, and Modify'd, that the Eye
discern'd no more a Golden Colour, but a Greenish Blew. And for other's
satisfaction, we did in the Night look upon a Candle through such a Leaf of
Gold; and by trying the Effect of Several Proportions of Distance betwixt
the Leaf, the Eye and the Light, we quickly hit upon such a Position for
the Leaf of Gold, as that the flame, look'd on through it, appear'd of a
Greenish Blew, as we have seen in the Day time. The like Experiment try'd
with a Leaf of Silver succeeded not well.
* * * * *
_EXPERIMENT X.
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