- ( ) 
ry with it what- Bodies it meets with in its way ; which 
will more eafily afQend according as their Surfaces are- 
greater in proportion to their wc^ight. And our Author 
tells us, that if the Specifick weight of Bodie§, the force 
that impels them, and c.he meafure of their Surfaces be 
rightly confider dj^’ic will be no hard matter to give an 
* ^count of Volatility and Fixed nefs, and all the appear- 
ances of Diftillation and Sublimation ; in which lalt on- 
ly lolid Bodies arc raifed by the force oi Fire. 
In hisLeduf e on Fermentationjhe deduces the caufe of 
Ebullition and Etfervefcence* from the attractive force of 
the Particles of Matter, and particularly thofe of Salts; 
which he fays' are very fi mple and fmall Bodies, and 
in proportion to their bulk very folid, and mult of 
conlequence be endowed with a very Itrong attractive 
Pp wer. Upon which account, and that of the fmall- 
nefs of thiri’' force of Cohelion, .he Flows the reafon 
why they are fo eafily diffolvcd into Water, and not in 
Sp irit of Wine; as alfo why Water can only dilTolve a 
certain proportion of thefe Salts, fo that whatever 
qucintity greater than this is immerfed in Water, re- 
mains -undilTotved. 
The Solution of all otli^r 'Bodies is to be deduced 
from' the fame Principles ; but to uiiderftahd them right-, 
ly, it is neceilary to elHmate the widenefs of the Pores 
of thefe Bodies, the firce by which the Parts cohere 
together, and the efficacy or force of motion iiivthe Parts • 
of the Mehlffuum ^ which.laft arifes from the difference 
of attraftions of the Particles of tlie MeniFruum to one 
another, and to the Parts of the Body, and from their 
elalticity. And upon thefe Grounds lie explains the va- 
4'ious Flioeiiomena of Dilfolutions ; particularly* of that 
bithertot unaccountable one of Aqud Regia dilTolving 
Gold, but not Silver, whereas 'Aqua For\is^ of which 
t\i€ Aqua Regia is made, dilToives Silver but not Gold; 
wliich he illulfrates and reduces to a plain Calculation. 
Zz In 
