his multitude of
eye-balls, to see any object distinct (for as I hinted before, onely those
parts that lay in, or very neer, the optick Lines could be so) the
Infinitely wise Creator has not left the creature without a power of moving
the head a little in _Aerial crustaceous_ animals, and the very eyes also
in _crustaceous_ Sea-animals; so that by these means they are inabled to
direct some optick line or other against any object, and by that means they
have the visive faculty as compleat as any Animal that can move its eyes.

Distances of Objects also, 'tis very likely they distinguish, partly by the
consonant impressions made in some two convenient Pearls, one in each
cluster; for, according as those congruous impressions affect, two Pearls
neerer approach'd to each other, the neerer is the Object, and the farther
they are distant, the more distant is the Object: partly also by the
alteration of each Pearl, requisite to make the Sensation or Picture
perfect; for 'tis impossible that the Pictures of two Objects, variously
distant, can be perfectly painted, or made on the same _Retina_ or bottom
of the eye not altered, as will be very evident to any one that shall
attentively consider the nature of refraction. Now, whether this alteration
may be in the Figure of the _Cornea_, in the motion of access or recess of
the _Retina_ towards the _Cornea_, or in the alteration of a crustaline
humour, if such there be, I pretend not to determine; though I think we
need not doubt, but that there may be as much curiosity of contrivance and
structure in every one of these Pearls, as in the eye of a Whale or
Elephant, and the almighty's _Fiat_ could as easily cause the existence of
the one as the other; and as one day and a thousand years are the same with
him, so may one eye and ten thousand.

This we may be sure of, that the filaments or sensative parts of the
_Retina_ must be most exceedingly curious and minute, since the whole
Picture it self is such; what must needs the component parts be of that
_Retina_, which distinguishes the part of an object's Picture that must be
many millions of millions less then that in a man's eye? And how exceeding
curious and subtile must the component parts of the _medium_ that conveys
light be, when we find the instrument made for its reception or refraction
to be so exceedingly small? we may, I think, from this speculation be
sufficiently discouraged from hoping to discover by any optick or other