ANALYSIS OF A CAlOnLUS. 

 XII. 



Analysis of a Urinary Calculus: by Professor Wvrieu*. 



317 



F. 



racters of the 



stone. 



OR the stone I have now analj'sed I am indebted to 

 Mr. Michaelis, who extracted it fiom a patient by the ope- 

 ration. 



It was nearli' oval, but a little flattened : brown exterior- Physical ctia- 

 ly, and of a yellowish white within. It weighed exactly 

 870 grains German weight [834 grs. Eng.]. Its specific 

 gravity was 1*572. Its surface was irregular, and a little 

 rough. It was of the consistence of hard chalk, was with- 

 out a nucleus, and composed of layers. 



1. I macerated 300 grains of this concretion, previously chemical ex»- 

 powdered, in distilled water at the temperature of 12* R. nunation. 

 [59" F.] for two days. Having filtered the lujuor, it was Water took up 

 without colour; and neither afforded any precipitate, nor "o'^'"S- 

 was perceptibly changed, by nitrate of mercury, nitrate of 



alver, muriate of barytes, barytes-water, lime-water, oxalic 

 acid, potash, or ammonia. It is evident therefore, that the 

 distilled water had taken up none of the constitiient parts of 

 this urinary concretion. 



The powder when dried weighed as much as at first. 



2. This jvowder I left for two days in muriatic acid of the Murialicacid 

 specific gravity of 1*181, at a temperature of 15" R. [05-75° °^ "^ 

 F.], and then added to it distilled water. After filtering, I 



dried the residuum thoroughly, which then weighed 248 

 grains, and was of a reddish brown colour. 



3. The filtered liquor, precipitated by lime-water, af- phosphate of 

 forded a powder, which when collected and examined was 



found to be phosphate of lime. It weighed 52 grains. 



4. The 248 grains that remained from the second experi- Potash dissolr- 

 ment v/ere put into a solution of potash a little diluted, and ^^ """^ """'"^-^^ 

 left m it for two days at a temperature of 18 R. [72'5 F.J. matter. 



I then filtered oflF the liquor, from which acetous acid threw 

 doWn a precipitate weighing 230 grains. This, carefully 

 examined, consisted of 226 grains of uric acid, easily dis- 

 tinguishable by its properties and characteristics, and about 

 4 gi-ains of animal matter. 



* Annales de Chimie, vol LX, p, 310. 



5. Whaf 



