ayes to magnifie the Object beyond a determinate bigness. Against which
Inconveniences the only Remedies I have hitherto met with are these.

First, for _Microscopes_ (where the Object we view is near and within
our power) the best way of making it appear bright in the Glass, is to
cast a great quantity of light on it by means of _convex glasses_, for
thereby, though the aperture be very small, yet there will throng in
through it such multitudes, that an Object will by this means indure to
be magnifi'd as much again as it would be without it. The way for doing
which is this. I make choice of some Room that has only one window open
to the South, and at about three or four foot distance from this
Window, on a Table, I place my _Microscope_, and then so place either a
round Globe of Water, or a very deep clear_ plano convex_ Glass (whose
convex side is turn'd towards the Window) that there is a great
quantity of Rayes collected and thrown upon the Object: Or if the Sun
shine, I place a small piece of oyly Paper very near the Object,
between that and the light; then with a good large Burning-Glass I so
collect and throw the Rayes on the Paper, that there may be a very
great quantity of light pass through it to the Object; yet I so
proportion that light, that it may not singe or burn the Paper. Instead
of which Paper there may be made use of a small piece of Looking-glass
plate, one of whose sides is made rough by being rubb'd on a flat Tool
with very find sand, this will, if the heat be leisurely cast on it,
indure a much greater degree of heat, and consequently very much
augment a convenient light. By all which means the light of the Sun, or
of a Window, may be so cast on an Object, as to make it twice as light
as it would otherwise be without it, and that without any inconvenience
of glaring, which the immediate light of the Sun is very apt to create
in most Objects; for by this means the light is so equally diffused,
that all parts are alike inlightned; but when the immediate light of
the Sun falls on it, the reflexions from some few parts are so vivid,
that they drown the appearance of all the other, and are themselves
also, by reason of the inequality of light, indistinct, and appear only
radiant spots.

But because the light of the Sun, and also that of a Window, is in a
continual variatio