"November the 29th 1693, Dr Hook read a Discourse concerning Microscopes, their Uses and Advantages in discovering the Textures and Motions of Bodies, as well animate as inanimate; observing, that all Examinations by Fire, or Chymical Menstruums, destroyed or altered the compounding Particles, or mix'd them with, and confounded them with heterogeneous Parts of the Fire, or Menstruum, made Use of; whereas the Microscope discovers them in their natural State and Actions. Observing farther, that the Motions of the Viscera and of the Fluids, in the small Vessels, are, by that Instrument, to be seen, by their different Colours and Refractions, through the transparent Skins and Bodies of many Insects: Natural History, hitherto, being for the most Part only conversant about the outward Shape and Colour of Plants, Animals, and the like; but the Microscope would afford a very large Field of Enquiries and Observations not yet much cultivated, which he recommends as one of the most proper Ways of discovering the true Texture and Mechanism of Bodies."