258 



added one drachm of acetous ,acid. After three hours, 

 a crystaUization of minute sandy particles took place. 

 None in the standard, even after three days. 



EXPERIMJBNT V. 



Thirty drops only, of acetous acid, were added to four 

 ounces of the urine of a gouty patient, aet. sixty, and who 

 sometimes felt some slight gravelly tendency. A very co- 

 pious precipitation of this matter quickly took place. Some 

 observable in the standard, also, the next day. 



EXPEEIMENT VI. 



To three ounces of healthy adult urine, were added a 

 few drops only of citric acid. A distinct crystallization, 

 but extremely minute, took place. No appearance of any 

 in the standard, after many hours. The experiment was 

 repeated with one drachm of filtered citric acid, which 

 only hastened the separation, and increased the quantity 

 of crystalline matter. 



Finding, by these experiments, and numberless others, 

 with a detail of which it would be unnecessary to take 

 up the time of the Academy, that the acetous and citric 

 acids, blended with the urine, separated its uric acid in a 

 crystallized state; I thought it might be interesting, to 

 investigate what the effect of the tartarous acid might be: 

 being that, which, in an uncombined, and partly combined 

 state of acidule, as in the acidulous tartarite of potash, 



chiefly 



