488 Mr. Home's Observations on Blood 
colour was more of a light brown, and after standing some 
time, a whitish powder was deposited ; the urine drawn off in 
the morning upon getting up, was nearly of the natural ap- 
pearance, but that brought away in the course of the day, had 
a deeper tinge, and more of the white sediment. It is also 
to be remarked, that the sediment evidently passed off only 
with the last part of the urine. On the 19th, the urine was 
tolerably clear, and the white sediment more completely se- 
parated, and in greater quantity. In the course of the night, 
while lying in bed, the patient voided naturally in many dif- 
ferent attempts, 4 ounces of water, but could not make any 
when up. The urine now continued clear from any tinge, 
but no more passed without the catheter being introduced, 
till the 28th, when he again made some water naturally, but 
could not completely empty the bladder ; on the 29th, the 
quantity which required being drawn off was less ; and by the 
5th of May he made water as usual, at which time the sedi- 
ment began to diminish, and gradually disappeared. 
From the symptoms which have been stated, it appears that 
part of the blood which passed into the bladder from the kid- 
ney had remained there, and formed a coagulum, which coa- 
gulum gaye a bloody tinge to the urine, and caused an inabi- 
lity to void it without assistance, till the coagulum was dis- 
solved. 
With a view to ascertain how far this had been the case, 
and discover what changes the blood undergoes when placed 
in such circumstances, I instituted the following experiments. 
They were performed by Mr. Charles Grover, a very in- 
genious surgeon, at present house surgeon in St. George's 
hospital. 
