when extravasated into the Urinary Bladder. 489 
Experiment 1. Four ounces of blood were drawn from the 
arm into a phial containing 4 ounces of fresh urine, and the 
phial was kept in the temperature of the human body ; in 
fifteen minutes the whole mixture formed an uniform firm 
coagulum, and appeared wholly composed of blood. 
This experiment was made to ascertain the probable time 
the blood would take to coagulate in the bladder. 
Experiment 11. Six ounces of blood were drawn from the 
arm into 6 ounces of fresh urine ; in fifteen minutes the whole 
mass became one solid coagulum. In seven hours, 6 drams 
of clear fluid were separated from it ; this was poured off, and 
the same quantity of fresh urine was added ; after standing nine 
hours it was poured off; some red globules were mixed with it, 
but sunk to the bottom undissolved. The coagulum had fresh 
urine added to it three times a day, the former urine being 
previously poured off, and allowed to stand some hours for 
examination. 
For the first five days the coagulum appeared to undergo 
little change, except becoming smaller in size, and the urine 
poured off from it was tolerably clear, but on standing de- 
posited a dark cloudy sediment. 
On the sixth day, the urine, when poured off from the coa- 
gulum, was of a dark red colour, and deposited a greater quan- 
tity of a dark coloured sediment, but on standing became to- 
lerably clear. 
On the ninth day, the coagulum was reduced to the size of 
the original quantity of blood drawn from the arm. 
On the 13th day, the size of the coagulum was a good deal 
reduced ; the urine poured off from it was still more tinged 
with the red globules ; but when allowed to stand, the upper 
3 R 2 
