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PROP. I. It's very probable, that Glass may be pierced into, at some distance, even by visible and tangible Bodies.
And besides the Arguments already offered to evince the porosity of Bodies, I shall add, That a certain Spirit of Salt being kept in a Glass in a cool Place, it corroded some Parts so much as to leave them as thin as a piece of Paper; and lined with a white Substance, which seemed to be some of the Alkali of the Glass and Sand corroded by the Saline Spirits of the Menstruum, and coagulated with them into this odd kind of concrete; and this wrought no higher than the Liquor contained in the Glass. And besides this, I had another Vi∣al corroded by a distilled Liquor of Vitriol, which contained more Phlegm than Oyl; and to this Relation I shall add, That a Pound of Dantzick Vitriol, and a Pound of Sea-Salt, the one calcin'd lightly, and the other decrepita∣ted, being distilled in a well coated Retort, by degrees of Fire, giving at the last a very strong one; when the Vessel was taken off, we found that the Heat had here and there melted it; and that the Fluxed Caput Mor∣tuum had corroded the Glass, fetching off Films from it; and those Parts which did not appear to the Eye manifestly wasted; seem∣ed by their brittleness to have been penetra∣ted; so that their Texture was spoiled by the Saline and Vitriolate Particles.