[ 3 6 9 ] 
ferutn is in a great, and the era {[amentum in a fmall 
proportion, bleeding and diluting would be highly 
improper. As it is therefore fuppofed ufefui to at- 
tend to the proportions of thefe parts in many dif- 
orders, and even to take indications of cure from 
them, it has been an objedt with thofe who have 
made experiments on the blood, to determine the 
circumftances on which its more perfedt reparation 
into thefe two parts depends ; it being obvious, that 
till this be done, our inferences from their propor- 
tions will be liable to confiderable fallacies. Two of 
the lateft writers on this fubjedt agree, that if the 
blood, after being taken from a vein, be fet in a 
cold place, it will not eafily feparate, and that a 
moderate warmth is neceflary: this is a fadt that is 
evinced by daily experience. They likewife fay, 
that the heat fhould be lefs than that of the animal, 
or than 98° of Fahrenheit’s thermometer; and that 
if frefh blood be received into a cup, and that cup 
put into water heated to 98 it will not feparate ; 
nay, they even fay, that it will not coagulate ; but 
this, I am perfuaded from experiments, is ill-founded. 
Experiment I. 
A tin-vefiel containing water, was placed upon a 
lamp which kept the water in a heat that varied be- 
tween 100 and 105 degrees. In this water was 
placed a phial, containing blood that inftant taken 
from the arm of a perfon in health ; the phial was 
previoufly warmed, then filled, and corked to ex- 
clude air. In the fame water was placed a tea-cup 
half full of blood, juft taken from the fame perfon ; 
Vol. LX. Bbb a 
