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I have repeated feveral times, that I might be fure 
of the fadt. I have alfo varied the experiment a 
little, having fometimes put the vein into a phial 
of water, and froze the whole in a folution of fai 
ammoniac in fnow; and fometimes I have put the 
vein into the folution itfelf ; and three or four times I 
have put it into oil, and then froze it ; but after all 
thefe trials, the refult was found to be the fame. The 
blood was always evidently fluid on being thawed, 
and as evidently jellied when expoled to the air. 
Thus far 1 have related fuch experiments as I have 
made, in order to difcover the caufes of the coagu- 
lation of the blood, out of the body. Next, if a- 
greeable to this learned Society, I (hall lay before 
them fome other experiments that I have made on 
this fluid. 
XXXIli. On 
