neareftand immediatly to thety^r^w^ of the Blood which 
feems to be its proper Vehicle. 
We fliall be the lefs furpriz^ to derive fuch firm and 
folid ProduUions from fluids, when we conlider that there 
are particles floating in the Blood always difpofed to be 
converted either into Grijiles, or to make up the foUd 
Skl^ll, Nailes, Bones , ^c. and that even the TV^?^/' whofe 
Texture is very firmware made and fnpplyed out o: thefofc 
fluids of the Body. 
Even fome of thefe folid parts of the Body may by a 
Difeafeoi the Blood he abraded and abforbed by the com- 
mon i?///^ and precipitated by their own weight upon 
the Pelvis ; or elfe ftick in the Tubules of the IQdnieSy 
and fo choak them up, and by degrees extend them to 
a l^pture, or grind them to pieces by a conftant impulfe 
of this gritty fubjlance, which may at laft convert the 
greateft part of the IQ,dnies into this (ivmConcrete. 
Moreover without any refpedt had to thefe iolid abra- 
fions, the Blood it felf (o{ which the Serum is a great part 
and with which it is intimately mixt^ confifts of heteroge- 
neous Particles, of fo various formSjfizes and fliapes^which 
feems neceflary for their accommodating themfelvesto 
all parts, that even thefe defignd toconftitute the foIM 
parts, may fuffer fuch irregular changes in the Body, 
which may unfit them to pafs the emulgent Vein, andfo 
to continue their Circulation, Info much that the eoii*- 
tinned Impu.fe of this matter by tlie Artery may make ve^ 
ry cbnfiderable Aggregates ov Concretions in the t^d* 
neys. 
And not only (o but without either vei^eOc to Vein or 
Artery, the ferous or watery part oi" the Blood, which we 
faid before was the Vehicle of the Stone.m^j have imbibed 
fuch heterogeneous grofs and ponderous Particles, as may 
whilfiin circulation, flucStuate a/zd mix well enough toge- 
ther, but may very eafily feparate upon the leaft Stagna^ 
tton. Thus Water arid unite only by com ail ^ and 
that 
