C 4,86 
XXI. Observations on the Changes which Blood undergoes , 
when extravasated into the urinary Bladder, and retained for 
some Time in that Viscus , mixed with the Urine. By Everard 
Home, Esq. F.R.S. 
Read June 16, 1796. 
The greater number of cases in physic and surgery are only 
important and interesting to those engaged in the study of 
medicine ; they are not connected with general science, and 
therefore do not properly come under the consideration of this 
learned Society. 
Practitioners, however, in these professions have, upon many 
occasions, brought to light facts of importance in the animal 
ceconomy, which could only be discovered while the human 
body was labouring under disease ; and those have been distin- 
guished with a place in the Philosophical Transactions. 
As every change the blood undergoes must appear an object 
of importance to those who study the ceconomy of animals, I 
am induced to believe the present observations on the change 
produced on it by being mixed with the urine, will not be con- 
sidered as wholly undeserving of notice. 
I was led to pay attention to this subject from considering 
the following case, which came under my care. 
A gentleman, seventy-one years of age, in the spring 1795, 
found that in making water, the urine had the appearance of 
