'The structure of the eye, and of all its appurtenances, the admirable contrivances of nature for performing all its various external and internal motions and the variety in the eyes of different animals, suited to their several natures and ways of life, clearly demonstrate this organ to be a masterpiece of nature's work. And he must be very ignorant of what hath been discovered about it, or have a very strange cast of understanding, who can seriously doubt, whether or not the rays of light and the eye were made for one another with consummate wisdom, and perfect skill in optics.''³