y_, that the order of these eies or _Hemispheres_ was altogether
curious and admirable, they being plac'd in all kind of Flies, and _aerial_
animals, in a most curious and regular ordination of triangular rows, in
which order they are rang'd the neerest together that possibly they can,
and consequently leave the least pits or trenches between them. But in
_Shrimps_, _Crawfishes_, _Lobsters_, and such kinds of _Crustaceous_ water
Animals, I have yet observ'd them rang'd in a quadrangular order, the rows
cutting each other at right angles, which as it admits of a less number of
Pearls in equal surfaces; so have those creatures a recompence made them,
by having their eyes a little movable in their heads, which the other
altogether want. So infinitely wise and provident do we find all the
Dispensations in Nature, that certainly _Epicurus_, and his followers, must
very little have consider'd them, who ascrib'd those things to the
production of chance, that wil, to a more attentive considerer, appear the
products of the highest Wisdom and Providence.

Upon the Anatomy or Dissection of the Head, I observ'd these particulars:

First, that this outward skin, like the _Cornea_ of the eyes of the greater
Animals, was both flexible and transparent, and seem'd, through the
_Microscope_ perfectly to resemble the very substance of the _Cornea_ of a
man's eye; for having cut out the cluster, and remov'd the dark and
_mucous_ stuff that is subjacent to it, I could see it transparent like a
thin piece of skin, having as many cavities in the inside of it, and rang'd
in the same order as it had _protuberances_ on the outside, and this
propriety, I found the same in all the Animals that had it, whether Flies
or Shell-Fish.

Secondly, I found that all Animals that I have observ'd with those kind of
eyes; have within this _Cornea_, a certain cleer liquor or juice, though in
a very little quantity, and,

I observ'd thirdly, that within that cleer liquor, they had a kind of dark
_mucous_ lining, which was all spread round within the cavity of the
clutter, and seem'd very neer adjoining to it, the colour of which, in some
Flies, was grey; in others, black, in others red; in others, of a mix'd
colour; in others, spotted; and that the whole clusters, when look'd on
whilst the Animal was living, or but newly kill'd, appear'd of the same
colour that this coat (as I may so call it) appear'd of, when that outward
skin, or _Cornea_, was remov'd.

F