SOME OBSERVATIONS 



ON 



URINARY CALCULI. 



Cujus rei nnttira in pnrltonibus tjus mimmis optimr ctrmtnr. 



ARISTOTF.LIS. 



BOUT the time when the celebrated Schccle 

 was making his experiments oji urinary calculi, 

 I, not knowing that he was To engaged, had en- 

 tered upon the fame tafk. In the proccfs of my 

 experiments I not only difcovcrcd with Schcele, 

 that thoic calculi contain a peculiar acid in a 

 concrete folid ftatc, but made fome other obfcr- 

 vations not corrcfponding to his ; but the diffe- 

 rence might poffibly bo occafioncd by a diver- 

 fity of nature in the matter on which our expe- 

 riments were made. 



I was unfuccefsful in all my attempts to dif- 



folvc calculi entirely in diflilled water, or nitrous 



acid. Indeed, the more minutely the matter is 



pulverifed, the fcanticr is the rcfiduc. But, 



L e fomc 



