d also discover several other of
smaller Magnitudes, not discernable by the twelve foot Glass: Thus have I
been able, with a good thirty six foot Glass, to discover many more Stars
in the _Pleiades_ then are here delineated, and those of three or four
distinct Magnitudes less then any of those spots of the fourteenth
Magnitude. And by the twinkling of divers other places of this _Asterisme_,
when the Sky was very clear, I am apt to think, that with longer Glasses,
or such as would bear a bigger _aperture_, there might be discovered
multitudes of other small Stars, yet inconspicuous. And indeed, for the
discovery of small Stars, the bigger the _aperture_ be, the better adapted
is the Glass; for though perhaps it does make the several specks more
radiant, and glaring, yet by that means, uniting more Rays very near to one
point, it does make many of those radiant points conspicuous, which, by
putting on a less _aperture_, may be found to vanish; and therefore, both
for the discovery of the fixt Star, and for finding the _Satellites_ of
_Jupiter_, before it be out of the day, or twilight, I alwayes leave the
Object-glass as clear without any _aperture_ as I can, and have thereby
been able to discover the _Satellites_ a long while before; I was able to
discern them, when the smaller _apertures_ were put on; and at other times,
to see multitudes of other smaller Stars, which a smaller _aperture_ makes
to disappear.

In that notable _Asterism_ also of the Sword of _Orion_, where the
ingenious Monsieur _Hugens van Zulichem_ has discovered only three little
Stars in a cluster, I have with a thirty six foot Glass, without any
_aperture_ (the breadth of the Glass being about some three inches and a
half) discover'd five, and the twinkling of divers others up and down in
divers parts of that small milky Cloud.

So that 'tis not unlikely, but that the meliorating of _Telescopes_ will
afford as great a variety of new Discoveries in the Heavens, as better
_Microscopes_ would among small terrestrial Bodies, and both would give us
infinite cause, more and more to admire the omnipotence of the Creator.

* * * * *

Observ. LX. _Of the _Moon_._

Having a pretty large corner of the Plate for the seven Starrs, void, for
the filling it up, I have added one small _Specimen_ of the appearance of
the parts of the Moon, by describing a small spot of it, which, though
taken notice of, both by the Excellent _Hev