4 9 2 Mr. Home’s Observations on Blood 
eighteenth, the coagulum was nearly dissolved ; so that the 
coagulum immersed in the urine dissolved two days sooner 
than that in the water. 
From this experiment we find, that it was the urine incor- 
porated with the coagulum in Experiment n. that prevented 
the red globules from dissolving, and preserved the coagulum 
for so long a time, since these effects were not produced by 
urine while simply surrounding the coagulum. 
If we compare Experiment n. with the result of the case, 
they agree so entirely, that it leaves no doubt of the process 
carried on in the bladder being similar to that which took 
place out of the body. The patient was unable to make water 
for twenty-four days, although the passages readily admitted, 
during the whole of that time, an uncommonly large instru- 
ment, which could not have been the case had there been any 
obstruction in them ; for six days more he voided it with dif- 
ficulty, but afterwards made water very well. 
The coagulum out of the body was reduced in twenty-five 
days to the size of a cherry, and in four days more it was 
completely dissolved. 
The patient’s urine became darker, from the red globules 
mixing with it, in nine days. In the experiment this took place 
in five days. 
The white sediment was first observed, in both instances, 
about the twelfth day ; it continued to be deposited till the 
patient got well, and to the end of the experiment. 
That the blood is capable of uniting with a quantity of urine 
equal to itself, so as to form a firm coagulum ; that the red 
globules do not dissolve in a coagulum so formed ; that an ad- 
mixture of urine prevents the blood from becoming putrid 
