The Following Observations were not written, with Intention that they Should be Annex’d to the Foregoing Essay, but to Gratify a Philosophical Physician. Which is the Reason why, besides those things that are more purely Optical, I thought fit to mention Some Others, that might be either Vseful or Grateful to an Inquisitive Man of his Profession. But having allow’d the Stationer to Expect, that this Book, tho’ it have for Title but an Essay, should not be of too inconsiderable a Bulk; I made choice of these Papers, among Several that lay by me, to increase the Bigness of the Book, Because that, the Eyes being those Parts of the Bodies of Men and other Animals, that I pitch’d upon in the Foregoing Treatise, to Strengthen the Doctrine deliver’d in it about Final Causes; it seem’d Suitable Enough to my Subject and Design, to mention some Vncommon Things that related to Vision or the Organs of it, that We may be invited both to Admire the Wisdom of God, which, to furnish Man with a Sense that requires the Concourse of so very many things, has, if I may so speak, Crowded them into so Small an Engine as an Eye; and to Celebrate his Goodness too, which has been Display’d in that, notwithstanding that the Eye is so very Compounded a Part, and the Sight so easily Vitiated yet the most part of Men by far do, from their Cradles to their Graves, enjoy the Benefit and Comfort of so Necessary and Noble a Sense.
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