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SECT. XII.
Which fraighten or fhut the Passages
or Valves, when the Urine secretes.
T HE Extension of the Steam in the

1 Guts, which compresses the Kidneys, and straightens the Ducts, the free Passage of the Steam, and Openness of the Pores, which discharges most of the Fluid that Way, Phlegm or any Sort of glutinous Meat or Drink, which fouls, or Salt, Gravel, Stone, &c. which corrodes or frets the Glands till they swell, Absorbents or blunt Corpuscles, which hinder the Agents from opening the small Glands in the sides of the Ducts. When the Steam is so strong in the Guts, that it not only prevails against the Pressure of the Air, but extends and stretches the Muscles of the Belly outward very much, the Blood being resisted only by the Strength of the Pressure of the Air, and the Skin in the outward Parts, a greater

Share of the Blood will pass that Way, Hence the and less through the Kidneys. The KidDisorder commonly neys will be violently compressed between called the the sides of the Guts, by the Expanfion Gravel of the Steam in them; and the Arteries,

Windy

Veins,

Veins, Ducts and Glands in them contracted and straightned, the Water will pass thinner, consequently, and in less Quantity: When any considerable or to tal Stóp is made there, or in any of the Paffages for the Urine below, the Bloodvessels are presently filled too full, the Blood becomes of a Confistency not fit for Circalation and Secretion, the Steam cannot get Vent for want of Space to move the Blood in, but recoils, throws up the unnatural Juices secreted into the Stomach, caufes Vomiting, and at last Fevers, &c. The Milt, or Spleen, seems to be under much the samie Circumstances as the Kidneys, liable to be extended when the Steam in the Stomach and Guts is weak; and compressed when it is strong: Whether the Pain there be occafioned by its Extension, when the Steam is weak, or Compression; when the Steam is strong, I have not had Opportunity to observe: Nor whether the Discharges out of the Pancréas be occasioned by the Weakness of the Steam in the Duodenum; and the Extension of the Steam in the other Parts, or by the Weakness of the Steam in all the Parts, or the Juices are pressed out of their Glands by the Strength of the Steam in the Stomach, or jointly

in the Stomach and Guts.' Whether the Liver, which is chiefly supplied with Blood by the Pressure of the Atmosphere, when it is compressed by Steam, in the Stomach and Guts, stronger than the Pressure of the Air, admit a due Share of the Blood to return from the lower Parts of the Body through it, or deny Admisfion, and keep the lower Parts extended and too full, or whether it then circulate a due Quantity of the Blood in itself, and secrete a due Quantity of Gall, and whether, when the Steam within is weak, the Liver do not extend, admit a greater Quantity of Blood, and secrete a greater Quantity of Gall, whether its Extension cause not that Preffure we sometimes feel about the Stomach ; whether it discharge the Juices out of the Gall-Bladder, when the Tension of the Guts is weak or strong, I cannot tell. But 'tis likely if those Juices be intended to encrease the Ferment, they are contrived to discharge when it is weak, if to abate the Ferment, to discharge when it is strong.

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SECT. XIII. A State of the Operations in an healthy

Perfon, how varied when empty, full, &c. In the various Positions of the Body in Reji, in 'Action, the various Effects of Meat, and Drink, composed of different sorts of Corpuscles, or dif

ferently freed. UT THEN you have an Inclination to

'eat and drink, you feel a Lankness, Lassitude or Feebleness in all the outward Parts, and a Gnawing or Sharpness within the Stomach ; the first occafioned by the Defect of Steam to move the Blood quickly, and distend the Parts ; and the latter by a brinous or falt Fluid remaining at the Bottom of the Stomach, which remaining in the Glands, and fecreting out of them, fall down to the Bottom of it, and raises' the Sensation of Hunger, or what we call our Appetite. Suppose there is some small Quantity of Phlegm lodged in the Stomach, or swimming upon that brinuous Matter, that the Guts, or the several Divisions of them are partly filled, the lower Parts of undige

L 3

sted

Ited crass Matter in Form of Excrements, and the upper parts of a thinner Matter composed Part of excrementous Mattes and Part of Fluid, and the uppermost Parts of Steam or empty, and the whole mixed with Salts, the Juices of the Gall, Pancreatick, &c. And that 'the lower Parts are extended with Steam, and hang in Folds or Bends, like Bags, and that the Stomach, upper Guts, &c. are lank, contracted and compressed by the Extenfion of the Guts below, into a little Compass, suppose the Body standing, or sitting at Rest, the common Quantity of Meat you chew and swallow, is mixed with the Saliva, goes down into the Stomach, and rests in a Malh upon the Phlegm and brinous Fluid, if there be any confiderable Quantity of the brinous Fluid, the Meat and Phlegm partly immerses in it. When you have drank the common, Quantity of any thin Fluid sufficient to dilute the whole, if the Fluid be warm, most of the Oil or melted Fat (if there be any) șises to the Top, most of the Phlegm next under it, next the Parts of the Meat which will swim in that Fluid, and next the Fluid with the Parts of the Meat near its own Gravity, hovering or settled to the Bottom in it. If the Fluid

be

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