תמונות בעמוד
PDF
ePub

:

cles in it proper for fermentation, is not certain But it is adapted to be vaftly expanded by a little Heat, and that Matter, which meets the Meat and Drink in the Stomach, is doubtlefs framed for fermentation and Divifion, and confifts of a Mixture of Salts and fluids; whether they have Gravity fufficient, or how they are kept in the Stomach, when the reft is discharged, or whether they fecrete or are iffued into the Stomach before the Meat and Drink are put in, or when they are put in, or during the time of their Diffolution, or continually, will hereafter be confidered.

Hence Water, Oil, earthy Matter, and Cold may be termed inactive or paffive, and Salts, Fire and Air active.

CHAP.

CHA P. IV.

The Corpufcles of fuch different Sorts of Bodies and Fluids mixed in the Stomach and Guts, will diffolve the Bodies in them, raife Steam, &c. proved by the Effects fuch Mixtures have out of the Stomach.

TH

HE Trunk of the Body is always filled by the Bowels and Guts, and the Stomach and Guts are more or lefs diftended, as they are more or less filled by Meat, Drink, or Steam, into the Space which contains the Lungs, and as the force which extends them, or the force of the Atmosphere prevails, the Cafe of the Belly is extended more or lefs. The more the Stomach and Guts are contracted, the more space the Lungs have to play in. As the Lungs extend, they partly compress the steam in the Stomach and Guts, and partly extend the Cafe of the Belly. As the Lungs contract, the steam in the Stomach and Guts expands part, and the case of the Belly contracts part. The Liver, Milt, Kidneys, &c. are there

by

by compreffed and relaxed, of which more hereafter.

The Atmosphere without, compreffes the Stomach and Guts, and the Steam within, diftends them. The Action of

the Lungs, by preffing and relaxing, moves them, when the Body is at reft: And the Motion of the Parts in Action and the Agitation of the Body in Motion, fhifts and renverfes the Matter in the Stomach and Guts variously.

When all the forts of Matter aforefaid are mixed in a thick Fluid in the Stomach, there is at firft the Preffure of the Atmosphere upon every Side of the Stomach, and the Gravity of the Matter, and the Elafticity of the Air mixed in it, fo that if the Stomach were not moved, the Particles of Matter which are lighteft, must make up to the Surface, with force and speed equal to thefe two Preffures, the Elafticity of the Air, and the force gained in their Motion. Suppose a Corpufcle of Fire or volatile Salt at the Bottom, it afcends till it meet with a Mass of Matter, and with one of its Points ftrikes between two or more Corpufcles, and if their Adhefion be not too strong, fplits them, and they fly the one the one Way, and the other the other, with a

force

force equal to the Strength of their Adhefion: The Corpufcle purfues its Way upward by the fame Impulfe, and if the two fplit ones, or one of them, be either Fire, Air, or volatile Salt, it strikes against fome other Body, or is pushed back by the Fluid, or begins to mount upward, and act as the other. If they be Matter as heavy as the Fluid, they attend till other Corpufcles afcend and split them, and so on, till all the Corpufcles of Fire, volatile Salts, and Air, after many Oppofitions get to the Surface, and if there be Space there, the most volatile form a Steam which preffes ftronglier. But by the Motion of the Lungs upon the Stomach, and the Motion of the Body, the Contents of the Stomach are frequently inverted or turned topfy turvy, fo that the lightest Corpufcles are continually afpiring and dividing the heavier, and continually turned down, and the heavier fixt Salts contribute by friction till they, by dividing the Matter infinitely fmall, make it take up a greater Space; and by the buftle the Corpufcles make in flying this Way and that Way with great force, and the Elafticity of the Air, expand the fluid in Proportion to the Quantity of the Agents, and their Agitation; fo prefs ftrongly

against

against the Stomach, which is ftrongly compreffed by the Air without, and thereby the volatile Matter, as the Corpufcles of Fire, Air, volatile Salts and Particles of the Water, Oil, and earthy matter to which they adhere, or which they can drive along with them, prefs into the upper Parts of the Guts, and thence into the lacteal Veffels, where they only find Vent in form of Steam, and by that force drive the craffer Matter, which will not pervade them, downwards.

If the volatile Matter were fuffered to reft at the Top of the Stomach, or go off freely, as it afcends fucceffively, the fermentation would foon cease, or go on very flowly, as it does upon the Liquor in a Guilefat unmoved. But the Motion of the Lungs and Body renews the Operation, as beating in the Liquor in an open fat does. But if fermenting Liquor be in a clofe Veffel, especially if it be moved much, it will make the Veffel extend, and if it get not Vent for the Steam, burst it; if it get Vent, iffue in Steam and Bubbles during the ferment. When in an open Veffel, the Matter in the fluid is fufficiently divided, and thofe Bodies which would afcend gone off, or fheathed in, or adhered to, other Corpufcles, fo

that

« הקודםהמשך »