[ 395 3 
blood that had a cruft, than they did in the fcmtii 
of that blood which had no cruft. Thence I am 
to conclude, that the ferum is not attenuated in thofe 
cafes where the inflammatory cruft appears- 
Xp fee whether the fpecific gravity of the red glo- 
bules was incrcafed, I tried as follows. 
Experiment XVIII-. 
I poured into a phial C a portion of the ferum 
of the blood which had no cruft ; and likewise into 
another D a fecond portion of the fame ferum. I 
then added to C a tea-fpoonful of the fame ferum , 
loaded with red particles from the blood which had 
an inflammatory cruft. And into D I poured a 
tea-fpoonful of the fame ferum, loaded with the 
globules of blood which had no cruft. In viewing 
thefe, I could not obferve that the globules of the 
blood which had an inflammatory cruft fubfided at 
all, fooner than thofe of the blood which had none ; 
thence I am inclined to conclude, that the fpecific 
gravity of the red particles, or globules as they are 
called, is not increafed in thofe cafes where the cruft 
appears. And, therefore, fince that inflammatory 
cruft or fize, feems neither owing to the ferunis be- 
ing attenuated, nor to an increafed fpecific gravity in 
the red particles, it is probably intirely owing to a 
change in the coagulable lymph. And, what feems 
farther to confirm this inference, in none of thefe 
experiments did the red particles fubfide from the 
furface of the J'crum in 20 minutes, though where 
the cruft appears, they fubfidefrom the furface of the 
whole mafs of blood in half that time ; fo that the 
E e e 2 whole 
