^of, how thai; in every ajfignahle point thefe veficles are 
. adorn d with capillary blood-veffels, fo that the point of 
;a needle every where draws blood; if we cakiiiaCe the 
. inxvardConcave fuperficies of the Lungs, fuppofed unfold- 
ed and fpread out into a plain, which muft needs exceed 
the outward apparent r^?»^^^? a; above an hundred times,and 
jconfequently confider the vaft furface of Blood each 
.moment expos d to the Air: Laftly, if we al!mythe/;2- 
grefs of the Air into the Blood upon breathing, which 
fcarce any now deny, I fay if we reflefl on thefe things, 
'tis eafie to imagine how fuddenly mifchievous any coagu- 
lathe poyfonous fteam may prove, lince together with 
the Air 'twill be difFus'd through all the Blood contain d 
in the Langs at the very Injiant of Infpiration, and, (whe- 
ther it be auftere or acid or both, or what other name 
.Phyficians may pleafe to give it) joyns per minima 
with almoft each particle of Blood, and (^as fteams of 
hot lead (they fay) fix Qgickfilver into a foiid^ prefently 
deftroys all Fluidity, ftuffs the Lungs and Heart with an 
tmmoveable and almoft mortifi'd Mafsj puts a fina!ftop 
to the Circulation, and fo in a moment breaks off the 
Series and Thred of Life. 
The Concretions that have fuch furprizing events we 
muft allow to be fuddenly produc't ; and we may aicribe 
all perhaps to the exceeding ^m/^;2^/f and adivity of the 
acid, or what other quality gave their origine, but never- 
thelefsinthe cafe of lingringBifeafes, I think it wi 1 be 
no hard matter to prove, (not to contend that they dif- 
fer from thofe already mentioned) that at leaft they make 
a llower progrefs in their growth as proceeding from a 
lefs adive caufe, and confidering the nature and con- 
fiftenceof the bodies themfelves, the Difeales and Sym- 
ptoms that ufually accompany them, and the circum- 
ftances of thofe DiffecStipns that have difcover d them, 
they muft needs appear a worksi time, and by a daily ap- 
pofition of nerv parts Jwell into that Jlrange B:il\ and 
Jhape they fometimes obtain. 
P What 
