Prof. E. D. Simth on Calculous Affections. 301 
among the best services which that science could render to 
the healing art.”* 
_ In this grand and humane enterprise, omitting the men- 
tion of inferior names, the genius of a Black was exerted in 
y 
Here it is that chemical knowledge is of signal benefit 
affords v in a labyrinth, that would otherwise be 
impervious. A kind providence often furnishes premonito- 
ry symptons of threatening dangers, and by a timely atten- 
tion to these, an impending evil may be averted. Thus it 
has been ascertained by chemical analysis, that the urine is 
a very compound fluid, containing both acids and alkalies 
in various states of combination, but so adjusted as that the 
ould present an apparently uniform and homogene- 
ous mass in the healthy state—by disease, these circum- 
treatment. Observation has proved that the greater num- 
ber of these concretions consist of uric acid; 1prine! ly, 
earths, which ought to be held in solution by an excess of 
acid, but are deposited in the bladder in consequence of 
disease. Happily, before any such deposi 
* See No, 33,1810. 
