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 ry wonderful Manner: He began first to demonstrate, that there was a Principle of Gravity inherent in all Matter, which made it tend to the Center. Tckbrff, who knew the Part he was to act, would now and then deny something that he had said. The old Gentleman, to confirm his Assertion, would give a mathematical Thump to the Bottom of the Boat, which would cause it sensibly to descend; and thus he would sink it to any Depth requir'd. Whenever we had a Mind to raise the Boat, the old Gentleman would suffer his Hypothesis to be refuted, and withhold his Demonstrative Fist.

We sail'd very pleasantly for about a League, and saw all the Wonders of the Deep: There were three Windows in our Barge made of transparent Steel; one of each Side, and one at the Stem [sic]. My Veracity in this may be doubted; but when a Man considers that Bodies are made transparent when their Pores lie in rectilinear Directions, the only Difficulty will be to prove that Steel may have its Pores dispos'd in this Manner; and the best Way to prove this, will be to explain the Manner in which the Steel was made transparent. The old Gentleman, before mention'd, took three Pieces of Steel, and beat them with an Hammer till they were very thin: This Work indeed requir'd some Time. He then took the Steel Plates, and put each of them between two Fires of equal Degrees of Heat, and let them remain so long between the Fires, that the Particles of the opposite Fires, by their acting upon the Steel, and attracting each other, at length found a Passage through the Steel, which was made pliable by their uninterrupted Action on either Side. When he found that the Holes, through which the Fire had pass'd, were big enough to suffer the Rays of Light to pass through, he threw Water upon the Steel Plates, which cool'd them, and