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not be fuppofed to be the caufe of the blood’s coa- 
gulation out of the body. 
To lee the efteds of cold on the blood, I made 
this experiment. 
Experiment V. 
I killed a rabbit, , and cut out one of its jugular 
veins immediately, proper ligatures being previoufly 
made upon it ; I then threw the vein into a folu- 
tion of fal ammoniac and fnow, in which the mer- 
cury flood at the 14th degree of Fahrenheit’s ther- 
mometer. As foon as the blood was frozen I took 
the vein out again, and put it into luke-warm water 
till it thawed and became foft j I then opened the 
vein, received the blood into a tea-cup, and ob- 
lerved that it was perfectly fluid, and in a few mi- 
nutes it jellied or coagulated as blood ufually does. 
Now, as in this experiment the blood was frozen 
and thawed again without being coagulated, it is e- 
vident that the coagulation of the blood out of the 
body is not folely owing to cold, any more than it is 
to red. 
Next, to fee the effedts of air upon the blood, I 
tried as follows. 
Experiment VI. 
Having laid bare the jugular vein of a living 
rabbit, I tied it up in three places, and then opened 
it between two of the ligatures and emptied that part 
of its blood. I next blew in warm air into the 
empty vein, and put another ligature upon it, and let- 
