CAtCBM. 337 



kxp. 5. Thirty drops only, of acetous acid, were Experiments 

 added to four ounces of the anne of a gouty patient, ist. ^^^j^g ^^^ nxinef 

 sixty, and who sometimes felt some slight gravelly tendency. &c. 

 A very copious precipitation of this matter quickly took 

 place. Some observable in the standard, also, the next 

 day. 



Exp. 6. To three ounces of healthy adult urine, were 

 added a few drops only of citric acid. A distinct cry- 

 stallization, but extremely minute, took place. No ap- 

 pearance 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 o{ 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 prevails in the wines and beverage of those couru 

 tries most subject to these complaints. 



Exp. 7. To four ounces of healthy adult i.rine, wers 

 added some drops only of pure tartarous acid. To the 

 same quantity, one drachm of acetous acid; which brought 

 them nearly to the same standard of acidity : a circumstance 

 always attended to in the comparative trials with different 

 acids. In that with the tartarous acid, the crystals were 

 not only larger and darker coloured, but exceeded in 

 quantity any thing before observed. In that with the 

 acetous acid, a much smaller proportion of minute crystals 

 took place. 



Exp. 8. To four ounces of urine, were added two 

 drachms of a filtered solution of acidulous tartarite of 

 potash, of the temperature of 55 degrees. The usual 

 separation and crystallization took place, in large propor- 

 tion : the crystals, however, much smaller, and less 

 coloured, than those with th» uncdjabined tartarous acidc 

 The two last experiments, frec^ueiitly repeated, presented 

 the same results. 



Vol. XVL-^May, 1807. 2 D Ex^. 



