[ 40i ] 
faff is the more remarkable, fince it fhews the im- 
probability ci die opinions of' thofe who maintain 
that this vitiated blood is the came of the difeafe,. 
fince the difeafe remained, though the properties of 
the biood were .changed *. 
From this obfervation we may be led to think, 
that it may be ufeful to receive the blood more fre- 
quently into fmall cups, indead of a bafon, and to 
attend more carefully, to the alteration produced 
upon it by bleeding; as we may by that means per- 
haps learn to determine better, what quantities 
fhould be taken away in particular cafes. For it 
would feem probable that the operation is likely to 
have the mold effedt on the difeafe, in thofe cafes 
where the greated change is produced by its meaps, 
on the difpofition of the blood to coagulate ; and of 
that change, we can judge,, by comparing the blood 
in the fird cup, with that in the laft ; for the firfl 
cup will nearly fhew r the date of the blood at the be- 
ginning ; and the laft cup the date of the blood at 
tire latter part of the evacuation. 
It frequently happens, that indead of an inflam- 
matory crud over the whole furface of the craffamen - 
turn, there is only a partial one, which appears in large 
fpots or dreaks. In fuch cafes I have obferved, that 
* That the properties of the blood can be changed by empty- 
ing the blood -veflels, is likewife proved by an experiment 
hereafter to be related ; where the blood in an animal in health 
was found to have its difpofition to coagulation increafed, in 
proportion as the veflels were emptied, and as the animal became 
weaker. It may likewife be neceflary to mention, that though 
the inference is here drawn from two experiments only, yet I 
have likewife obferved the fame appearance in other cafes, which 
I have thought it unneceflary to relate. 
Vol. LX. F f f 
a 
