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.
Fourthly, that the rest of the capacity of the clusters was in some, as in Dragon Flies, &c. hollow, or empty; in others fill'd with some kind of substance; in blue Flies, with a reddish musculous substance, with fibres tending from the center or bottom outwards; and divers other, with various and differing kinds of substances.
That this curious contrivance is the organ of sight to all those various Crustaceous Animals, which are furnish'd with it, I think we need not doubt, if we consider but the several congruities it has with the eyes of greater creatures.
As first, that it is furnish'd with a Cornea, with a transparent humour, and with a uvea or retina, that the Figure of each of the small Hemispheres are very Spherical, exactly polish'd, and most vivid, lively and plump, when the Animal is living, as in greater Animals, and in like manner dull, flaccid, and irregular, or shrunk, when the Animal is dead.
Next, that those creatures that are furnish'd with it, have no other organs that have any resemblance to the known eyes of other creatures.
