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After this, they took a Charcoal, and viewing it with one of their best Microscopes, discovered in it an infinite multitude of pores, some bigger, some less; so close and thick, that they left but very little space betwixt them to be filled with a solid body; and to give her Imperial Majesty a better assurance thereof, they counted in a line of them an inch long, no less then 2700 pores; from which observation they drew this following conclusion, to wit, that this multitude of pores was the cause of the blackness of the Coal; for, said they, a body that has so many pores, from each of which no light is reflected, must necessarily look black, since black is nothing else but a privation of light, or a want of reflection. But the Emperess replied, That if all colours were made by reflection of light, and that black was as much a colour as any other colour; then certainly they contradicted themselves in saying, that black was made by want of reflection. However, not to interrupt your Microscopical inspections, said she, let us see how Vegetables appear through your Glasses; whereupon they took a Nettle, and by the vertue of the Microscope, discovered that underneath the points of the Nettle there were certain little bags or bladders, containing a poysonous liquor, and which the points had made way into the interior parts of the skin, they like Syringe-pipes served to conveigh that same liquor into them. To which observation the Emperess replied, That if there were such poyson in Nettles, then certainly in eating of them, they would hurt us inwardly, as much as they do outwardly? But they answered, That it belonged to Physicians more then to Experimental Philosophers, to give reasons hereof; for they onely made Microscopial inspections, and related the figures of the natural parts of Creatures according to the presentation of their glasses.