L [ 387 i 
Experiment X. 
I took a wide- mouthed phial, containing ferum> 
and placed a thermometer in it, and then put it into 
water which was kept warm by a lamp underneath ; 
and, in making this experiment with as much ac- ' 
curacy as I could, I found the heat required was 160% 
which is above forty degrees more than is neceflary 
for the coagulation of the lymph. 
As the blood is coagulable by heat, and as the 
heat of an animal body is increased in fevers, it has 
been fuppofed that the blood might be coagulated by 
the animal heat, even whilft it is circulating in the 
blood-veflels ; but there is little foundation for fuch 
a fuppofition, fince the animal heat is naturally only 
98 or ioo°, and in the moft ardent fever is not raifed 
above 1 1 2°. 
I (hall next proceed to enquire into the formation 
of the inflammatory cruft, or fize, as it is called. 
This remarkable appearance is frequently met with 
in inflammatory diforders, and is formed by the coagu- 
lable lymph’s being fixed, or coagulated, after the red 
particles have fubflded. It has indeed been fuppofed 
to be formed from the ferum of the blood } and an 
excellent writer on this fubjedt feems in doubt to 
which it fhould be attributed. But that it is formed 
by the coagulable lymph alone, after the red par- 
ticles have fubflded, appears from the following ex- 
periments. 
Experiment XI. 
In the month of June, when the thermometer in 
the fhade flood at 67 % I bled a mai) who had la- 
D d d 2 boured 
