Lastly, They shewed the Empress a Flea, and a Lowse; which Creatures through the Microscope appear'd so terrible to her sight, that they had almost put her into a swoon; the description of all their parts would be very tedious to relate, and therefore I'le forbear it at this present. The Empress, after the view of those strangely-shaped Creatures, pitied much those that are molested with them, especially poor Beggars, which although they have nothing to live on themselves, are yet necessitated to maintain and feed of their own flesh and blood, a company of such terrible Creatures called Lice; who, instead of thanks, do reward them with pains, and torment them for giving them nourishment and food. But after the Empress had seen the shapes of these monstrous Creatures, she desir'd to know, Whether their Microscopes could hinder their biting, or at least shew some means how to avoid them? To which they answered, That such Arts were mechanical and below the noble study of Microscopical observations. Then the Empress asked them, Whether they had not such sorts of Glasses that could enlarge and magnifie the shapes of great Bodies as well as they had done of little ones? Whereupon they took one of their best and largest Microscopes, and endeavoured to view a Whale thorow it; but alas! the shape of the Whale was so big, that its Circumference went beyond the magnifying quality of the Glass; whether the error proceeded from the Glass, or from a wrong position of the Whale against the reflection of light, I cannot certainly tell. The Empress seeing the insufficiency of those Magnifying-Glasses, that they were not able to enlarge all sorts of Objects, asked the Bear-men, whether they could not make Glasses of a contrary nature to those they had shewed her, to wit, such as instead of enlarging or magnifying the shape or figure of an Object, could contract it beneath its natural proportion: Which, in obedience to her Majesties Commands, they did; and viewing through one of the best of them, a huge and mighty Whale appear'd no bigger then a Sprat; nay, through some no bigger then a Vinegar-Eele; and through their ordinary ones, an Elephant seemed no bigger then a Flea; a Camel no bigger then a Lowse; and an Ostrich no bigger then a Mite. To relate all their Optick observations through the several sorts of their Glasses, would be a tedious work, and tire even the most patient Reader, wherefore I'le pass them by; onely this was very remarkable and worthy to be taken notice of, that notwithstanding their great skil, industry and ingenuity in Experimental Philosophy, they could yet by no means contrive such Glasses, by the help of which they could spy out a Vacuum, with all its dimensions, nor Immaterial substances, Non-beings, and Mixt-beings, or such as are between something and nothing; which they were very much troubled at, hoping that yet, in time, by long study and practice, they might perhaps attain to it.