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are more or less sheathed, or sheathed in different Sorts of Matter, I cannot determine. But I take what we call Spirits

to be volatile Salts, sheathed. Of Air.

Air has Gravity, Fluidity and Elasticity; Gravity in a less, and Fluidity in a greater Degree, than Water. How the Corpuscles of Air perform their elastick Operation, whether each of them is formed like two Sides of a Triangle, and the Pressure of the Atmosphere keeps them bent at a different degree, at each different Depth of the Atmosphere; or a greater Pressure compresses them to more acute Angles, and à less fuffers them to open to more oblique ones, and to form thicker or thinner Air; whether the Corpuscles of Fire are so framed, as only to enter between their outsides, and expand them by their own Space, and make the whole lighter by the Difference of Gravity; or whether they also enter between the Legs of each Corpuscle, and extend them in Proportion to the Force they are driven in with, and make them contain a greater Space, and so weigh lighter than both asunder, by varying each other's Specific Gravities, as 'tis called, or whether the Corpuscles of Fire can extend little Masses of Air like Bubbles of other Fluids, I can


hot determine. And whether, when a Bo-
dy moved in Air, receives a new force by
the Air, as a Fluid pressed after it; or by
the Sort of Vacuum it makes, those Cor:
puscles of Air extend their Legs, and set it
forward by their elastick Force ; and whe-
ther these Jets be not the Cause of the swift
Motion of Corpuscles of Fire in it; deserves
well to by considered. The Corpuscles of
Air, when they are not impelled by some
other Agent, separate from all other Fluids,
and collect into their Place; according to
their Degree of Gravity; and will not in
a Body ascend through any other Fluid;
unless formed into Steam by Corpuscles of
Fire and other Fluids; nor even then thro'
any dense fo!id.

'Tis hard to know whether the Cor- of Firë: puscles of Fire have any Gravity, or whether they adhere to one another; so as to form either a Fluid or solid Body. If they have Gravity; or are attracted towards the Center of the Sun, 'tis hard to conceive how any of them, with how great Force soever they are thrown; could come from thence hither:. Whether they

be of different size to require different - Forces to move them, and larger than

those which form Light, I am riot certain. But the Fermentation in fome Sorts.


of Wood, whilst it is, as we call it rotting, and some Bodies in the same Con. dition, emit Light in the Dark, and when that Wood is sufficiently fermented or rotten, a little Fire will consume it, and it will emit little Light or Flame, and the Fire will appear redith, which induces me to believe that Light consists of Corpuscles smaller then Fire, or that there are Corpuscles of Fire of different Magnitudes, or of different Gravities; however they are so small and so sharp, that they by the Pressure of the Air peryade, and in sufficient Quantity, divide the Corpuscles of almost all Bodies, except fome few whose Pores are so close that they cannot enter in fufficient Quantity; and some others, which are so open and their Corpuscles so hooked or twisted that they cannot divide them, pervade between and keep at a Distance the Corpuscles of all Fluids, and in Quantity expand them to a great Dimension; and so light, that, adhering to the Corpuscles of other Bodies, make those which would have sunk alone, swim in Water, Air, &c. and to make Corpuscles of Water, Oil, &c. which would have funk, to swim in Air, so that the Air would press them, if alone, to its Surface. But 'tis likely they are so very


small, that as soon as they are freed and
loose, by the Impulse they receive at Se-
paration, which, as it happens, is in all
Directions, the Air presses those which
fly fideways, or downward, again to the
fuel successively, and those which go up-
ward entangle with the Matter they bear
off with Air, with Particles of Moisture
or other Matter, and are detained in the .
Air, Water, &c. and descend with them
to the Earth, so that a vast Quantity of
them lie entangled in all sorts of Matter,
and may be freed and set to work by fric-
tion, fermentation, &c.' And supposing a .
Creature alive and healthy, supposes that
there is a sufficient Quantity of these
Corpuscles in its Body to keep the Juice's
thin, fluid, and as we call it warm, fuffi-
cient to commence a new fermentation ;
and the Absence of these Corpuscles is

Whether, what we call Cold, be only of Cold. the Absence of the Corpascles of Fire, whereby the Surfaces of the Corpuscles of Fluids are suffered to come nearer together, and become less fluid or more solid, or whether it be Corpuscles of Matter which can pervade the Pores or Intervals of Solids and Fluids, and entangle those of Fire, and hinder their Operation, or are lo


shaped, that when intermixed among the Corpuscles of Fluids, they fill the Intervals closer; or by Roughness, or &c, make them adhere together; or whether when they pervade a Vessel full of hot Steam, they affix to the first Corpuscles of Fire, and make them, and so they make one another subside ; or whether the Corpuscles of Fire in an Instant pervade the Vesfel, and fly to the outside, where there is a Vacuum for them, by Absence of their Species, and so desert the Corpuscles of Water, &c. which they bore up; to subfide, I cannot tell. But if there be such Corpuscles; 'tis likely they have more Gravity than those of Fire, and perhaps more than those of Air, and must be very small, and so shaped to pervade, where Air nor any other Corpuscles except those of fire, can. But whatever their figures be, they seem either to be blunt, or incapable of being mov'd briskly, or strongly enough to divide the Corpuscles of

other Bodies. Of the Sa- Whether the Saliva or Spittle be only a

thin fluid; to make the Meat break and pass down more easily, softened with some flimy Mixtures, to keep the Parts of the Mouth and Throat fupple and prevent friction, or whether it have any Corpus:



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