M. Wurzer on an Urinary Calculus from a Hog. 289 



of an urinary smell; and again dissolved, and the slimy matter 

 being separated from it, it gave the following results with re- 

 agents. 



a. With nitrate of silver it gave a precipitate immediately. 



b. With nitrate of barytes it remained unchanged. 



c. With solution of neutral muriate of platinum after the 

 lapse of some hours, from its dilute state, the well-known 

 reddish double-salt of platinum, and potash arose in the solu- 

 tion. After 24< hours it no longer increased. 



According to repeated experiments I have made before 

 (which thus deviate from those made by Wollaston and Mar- 

 cet), 100 parts of this double-salt are equal to 29-6 of muriate 

 of potash. As I obtained from 100 parts of this stone 8-868 

 of the double-salt, they indicated 2 625 of muriate of potash, 

 of course taking the dissolved double-salt also into account. 



4. Some of the powdered concretion heated with a solution 

 of caustic alkali, filtered, and saturated with acetic acid, did not 

 produce a deposit, nor did it become turbid ; thus proving that 

 the stone contained no phosphoric acid. 



5. The residuum of No. 3, shaken with potash till the smell 

 of ammonia had disappeared, filtered, saturated with muriatic 

 acid, mixed with ammonium [?J to excess, and then with a solu- 

 tion of muriate of lime, gave a precipitate of phosphate of lime. 



6. In powder this calculus was easily dissolved (and widiout 

 evolution of carbonic acid) in dilute muriatic acid. By am- 

 monia I precipitated triple phosphate of lime and ammonia, and 

 by half-an-hour's ignition converted it into phosphate of lime. 



7. From a solution of the calculus in muriatic acid, triple 

 prussiate of potash immediately precipitated prussian blue. 

 1 his concretion therefore contains iron in the state of prot- 

 oxide.— It consisted of: 



Phosphate of lime and ammonia . . 51-787 



Muriate of potash 2-625 



Protoxide of iron 0-169 



Slimy matter with a urinous smell . 1-64.8 

 Water • 43-573 



99-802 



Loss 0-198 



This concretion, although differing in form and other phy- 

 sical properties from the urinary calculus from a hog analysed 

 by my meritorious friend lirandes, greatly resembles it in its 

 component parts and their projjortions. The only difference 

 is, that the present subject of examination contains muriate of 

 jiotash, (which, as far as I know, has not as yet been found in 

 similar stones,) and protoxide of iron. 



V'ol. 66. No. 330. Oct. 1825. . Oo XL VI 11. On 



