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that all are divided, or balanced to near the same Gravity of the Fluids, some few Parts of the earthy or crass Matter will leisurely subside, and some few of the lighter will swim, and the rest be quiet; as old Ale, Wine, &c. till put into a new ferment by Motion, or some other Accident or Agent. Where the Corpuscles that constitute the Fluid are of near the fame Gravity, such as distilled Spirits, &c. they cannot be put into fermentation by any Motion, nor will they diffolve any Body immersed in them. But the Matter in the Stomach is of various Gravities always comprest by the Air without, and extended by Steam within, because it requires a great force to drive the Steam along the Fluids in the Blood vessels, quite out at the Lungs and Pores. And whilst the Lungs play, the Stomach and Guts are never suffered to lie one Minute still, so nothing in it can cease to ferment and emit the Steam, unless there be such a Quantity of Matter so cold, or so incapable of being acted upon, that the Agents be overpowered. :

These volatile and active Salts and Corpuscles of Fire act much the same Part, and after the same manner, upon Matter in the Fluids within the Stomach, as Fire

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or active Salts do upon Fuel in the Fluid of Air in a furnace. The Pressure of the Air and of the Fluid, and the Motion of the Fluid moves, and enforces the Corpus cles of volatile and active Salts and Fire, to act upon and divide the Bodies in the Fluid, as the Pressure and Motion of the Air moves and enforces the Corpuscles of Fire and active Salts, to act upon and divide the Parts of the Fuel in the Air. And Fluids beat back the Corpuscles of Salt to the Matter, as the Air does those of Fire to the Fluel. And 'tis likely that the Corpuscles of volatile Salt, bear near the fame Proportion of Gravity to Water, as those of Fire do to Air, and as there are Fluids of different Gravities, so there are Salts of like different Gravities, and ?tis likely of different Sizes, to fit the Pores of different Bodies, and 'tis likely the lightest fort, which I call active, and some of the volatile Salts, act jointly with Fire upon Fuel in the Air, as ʼtis vifible they do in Sulphur, as well as those of Fire act with Salts in the Fluid of Water, &c. And some active Salts or Spirits, when very pure, raise a Steam, wh i exposed to the Air, nearly resembling Flame or the Corpuscles of fire, pure and nearly. united. And the Dissolution of Bodies VOL. X.

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by volatile Salts, &c. frees more Corpufcles of volatile Salts, &c. as the Diffolution of Bodies by fire frees more Corpus. cles of Fire; and thereby the Actions are encreased; if the Motion continue, and there be sufficient fit Matter to work upon in Proportion to the Agents, freed Salts by their Agitation, and the Rebounds of them, and the Parts they divide, expand the Fluid containing them, in Proportion to their Motion and Agitation, as those of Fire do that of Air. Salts, and Fire, and Air, bear off the sniall Particles which adhere to them in form of steam from the Stomach, as fire does small parts of the Fuel, in form of Sparks or Smoke, and that Matter which is too heavy to be born off, and which the Strength of the Agents is not sufficient to divide, subside as Cinders, Alhes, &c. do in Fire in the Fluid of Air, Air contains Corpuscles of Fire, as Water does those of Salts diffusedly, and when such a Quantity of fire or Salt is collected as to act, those of the same fort join, fix upon the Body, and affist, as the Air or fluid moves them thither. Corpuscles of fire or Heat, as is most visible in Rooms where there is Fire burning and People perspiring them, are agitated, divide the Bodies in the Air, and perhaps the united

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Corpuscles of Air, and expand or adhere to the Corpuscles of Air, &c. and make them lighter, so that the Pressure of the circumjacent Air bears them up the Chimney, and fresh Air succeeds them, to agitate the Fire, and make its Corpus cles move and act; and 'tis likely supply more Corpuscles of fire, and perhaps with some nitrous or other Matter like Cold, because it burns better in cold Weather than in hot. In like manner the light Matter in fluids rises, and the succeeding Fluid supplies more Salts, &c. Thus ripe fern-seed, when one has stript them out of their Codds; and by the Pressure of the Air; or by the Corpuscles of Heat in it, their Skins burst, by that force and their own Élasticity jump up, fall down, and rebound so as to make a mighty Bustle. Thus the Corpuscles of some small fharp Salts called Acids, in a Fluid pressed by the Air, instantly enter the Pores, split, and divide the Particles of some other Salts, and jet the Parts each Way, and they rebound from one another, or are pressed back by the Air so as to cause à mighty Bustle and Explosion, and raise a fume like Smoke, and a small Quantity of them in the Stomach by the fame O. peration cause a sudden Effervescence there, and sweat all over the Body. Thus

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the Corpuscles of fire, moved quickly by the Pressure of the Air into the powdered Charcoal and Sulphur, and exciting the latent Corpuscles of fire and volatile Salts in them mixed among the Particles of Nitre, suddenly split them, and expand and burst the small Masses, and the split Parts by that Pressure, their own Elasticity, the Elasticity of the Air, and the Rebounds from any Thing which resists their Expansion, cause that terrible Explofion, and drives them off in form of Steam or Smoke, with that infinite force and Velocity, which we see in fired Gunpowder, that Way where it gets Vent; and in Proportion to the Space it has for Vent, and of the Sides which resist and encrease its force by rebounding. As the force of fire is encreased by being confined and rebounded on more Sides, more, so there be but sufficient Room to admit the Air, and let the Smoke pass, and the force of the Smoke which goes off is. encreased by the Narrowness and Length of the flues, and by the Number of Checks in them, and the Thicknefs or Closeness of their Sides, or what defends it from the Cold, as in Gunpowder, &c. So the force of Steam raised from a Fluid by Corpuscles of fire pervading the Pores of that which contains it, or by fermen

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