(.P5 ) 
In the firft Difcourfe^ he, proves by Obfervation, that 
both the red*and ferous parts of the iJiood are endowed 
with an attractive Power 5 and as in the Blood the 
Particles attraO: one- another, and coliere together, fa 
likewife do the Particles of different Fluids, that artj 
.feparated from it by 'Secretion. He. fays, it is evident 
that forne of the Fluids,, th^t are fecern’d from the 
Blood by the Glands, are really compos’d by the coheh- 
on of ieveral Ibrts of Farticies ; for in Milk there are 
3 or 4 feveral forts of Subltancxjs. Urine has the fame 
appearances, and contains perhaps more Principles, and 
there is no doubt but that Tears, Spittle, and Sweat 
are all compounded Liquors. Now if the Particles 
which attracl one another, are hill more powerfully at- 
tracted by the Fluid in which they fwim than by one a- 
nother, they can never of themfelyes feparate from the 
Fluid ; which is the cafe of Saks diffolved in a large 
proportion .of Water, and of Urine when it neither 
breaks nor fettles : But if the Particles fwimming in the 
Fluid are more ftrongly -attraefed by one another than 
by the Fluid, they muft necelfarily feparate from it, and : 
go into parts which will either fink, fwim, oralcend in 
the Fluid, according to their fpecifick Gravity. Thrs 
power of AttraHion, he fays^ is univerfally difufed 
throughout all Matter, and the real exigence of it, he . 
fays, can be denyed by none that will duly coafider the 
Experiments and Reafons given by. Sir in the , 
QuclPions annexed to the Latin Edition of his Opticks j 
and it feems to be the only Principle from which 
there can be drawn a fatisfaciory Solution of the Phsc- 
nomcna produced by the Minima Nat ar^e. And becaufe 
the whole Animal Oeebnomy depends upon it, he 
lay^down in eleven Propofitions lo many of the Laws 
of that univerfal Attradioh, with their DemoilifracibnS; 
as are requifitefor his prefent purpofe • and'tlieh'pro- 
ceeds to Ihow how -the Gorpufcles th^c compoiS die 
* Se-> 
