posture I desir'd (which for many Observations was
exceeding necessary) and adjusten it most exactly to any Object.

For placing the Object, I made this contrivance; upon the end of a
small brass Link or Staple HH, I so fastned a round Plate II, that it
might be turn'd round upon its Center K, and going pretty stiff, would
stand fixt in any posture it was set; on the side of this was fixt a
small Pillar P, about three quarters of an inch high, and through the
top of this was thrust a small Iron pin M, whose top just stood over
the Center of the Plate; on this top I fixt a small Object, and by
means of these contrivances I was able to turn it into all kind of
positions, both to my Eye and the Light; for by moving round the small
Plate on its center, could move it one way, and by turning the Pin M, I
could move it another way, and this without stirring the Glass at all,
or at least but very little; the Plate likewise I could move to and fro
to any part of the Pedestal (which in many cases was very convenient)
and fix it also in any Position, by means of a Nut N, which was screw'd
on upon the lower part of the Pillar CC. All the other Contrivances are
obvious enough from the draught, and will need no description.

Now though this were the Instrument I made most use of, yet I have made
several other Tryals with other kinds of Microscopes, which both for
_matter_ and _form_ were very different from common spherical Glasses. I
have made a _Microscope_ with one piece of Glass, both whose surfaces were
_plains_. I have made another only with a _plano concave_, without any kind
of reflection, divers also by means of _reflection_. I have made others of
_Waters_, _Gums_, _Resins_, _Salts_, _Arsenick_, _Oyls_, and with divers
other _mixtures of watery_ and _oyly Liquors_. And indeed the subject is
capable of a great variety; but I find generally none more useful then that
which is made with _two Glasses_, such as I have already describ'd.

What the things are I observ'd, the following descriptions will manifest;
in brief, they were either _exceeding small Bodies_, or _exceeding small
Pores_, or _exceeding small Motions_, some of each of which the Reader will
find in the following Notes, and such, as I presume, (many of them at
least) will be _new_, and perhaps not less _strange_: Some _specimen_ of
each of which Heads the Reader will find in the subsequent delineati