236 



Under these circumstances, I cannot help expresshig my 

 surprise, at finding M. Fourcroy still assuming the merit 

 of the discovery, of all the different component parts of 

 calculi; the uric acid, and phosphat of lime, excepted. 

 This circumstance must appear the more unaccountable, 

 when we consider, that the communication of Doctor Wol- 

 laston's experiments, was through the medium of the Trans- 

 a4;tions of the Royal Society for 1797- Finally, M. Four- 

 croy, to whom Europe stands not a little indebted, for 

 the present general diffusion of chemical knoAvledge ; and 

 to whom the medical profession owe the greatest obliga- 

 tions, for his unremitted application to animal chemistry, 

 has, in conjunction with Vauquelin, given us the result of 

 his researches upon five hundred calculi: from Avhich it 

 appears that they contain the seven following ingredients. 



1. Uric acid. 



2. Urat of ammonia. 



3. Phosphat of lime. 



4. Ammonico magnesian phosphat. 



5. Oxalt of lime. 



6. Silica. 



.., . 7- Animal matter. 

 ■;.'! :vr/rTfrj:;'. 



From the prevalence of any of these ingredients, or their 



relative proportions, he divides them into' four generia; and 



these again into twelve species: for an account of which 



I must refer to the tenth volume of the Connoissan6es 



,i,. : , Chimiques, 



