[ 397 ] 
tion ; it is often met with where there feems to be 
no fuch difeafe, in particular in the blood of preg- 
nant women. And we may likewife obferve with 
Sydenham, that even in thofe cafes where the blood 
has a difpofition to form a white cruft, yet if it 
trickle llowly from the vein, this Jize will not ap- 
pear ; for in fuch cafes, probably, the blood begins 
to coagulate before the whole has done flowing, lo 
that the agitation prevents the red particles from 
fubfiding from the furface. There are therefore fe- 
veral circumftances to be taken into the account, be- 
fore we judge, from the prefence or want of this 
Jize y whether there is, or is, not an inflammation. 
The whitilh cruft differs much in denfity in dif- 
ferent cafes ; in fome it is extremely denfe, in others 
it is fpongy or cellular, and contains a quantity of 
ferum in its cells. 
XXXIV. Further 
