cannot be perceived neither by our exterior senses, nor by their exterior motions; as for example, our Optick sense can perceive and see through a transparent body, but yet it cannot perceive what that transparent bodies figurative motions are, or what is the true cause of its transparentness; neither is any Art able to assist our sight with such optick instruments as may give us a true information thereof; for what a perfect natural eye cannot perceive, surely no glass will be able to pre∣sent.9. Of the Eyes of Flies.I Cannot wonder enough at the strange discovery made by the help of the Microscope concerning the great number of eyes observed in Flies; as that, for ex∣ample, in a gray Drone-flie should be found clusters which contain about 14000 eyes: which if it be really so, then those Creatures must needs have more of the sense then those that have but two, or one eye; cannot believe, that so many be made for no more use then one or two eyes are: for though Art, the emulating Ape of Nature, makes often vain and useless things, yet I can∣not perceive that Nature her self doth so. But a greater wonder it is to me, that Man with the twinkling of one eye, can observe so many in so small a Creature, if it be not a deceit of the optick instrument: for as I 0