232 



of this subject; Avith what success is but too well known. 

 And from this again had arisen the further prosecution 

 of this enquiry, by the celebrated Bergman. 



The result of the analysis of the latter was highly ho^ 

 nourable to the former chemist; as they perfectly agreed 

 in almost every particular, with the exception of some 

 small quantity of insoluble matter, and the presence of 

 lime, observed by Bergman: a difference now very easily 

 accounted for; the former having examined calculi of the 

 pure lithic acid, or, as it is now termed, uric Wind, (by 

 far the most common species,) and entirely soluble in pure 

 alkaline lixivia, and nitric acid. The latter, those of the 

 mixed kind, consisting, also, chiefly, of lithic acid, but 

 with interposed laminae; or, probably, a nucleus of either 

 calcareous phosphat, or oxalt of lime, Avhich frequently oc- 

 curs, in a very large proportion of these concretions. We 

 may also observe, that Bergman had not, at this period, 

 an adequate idea of the large pi'oportion and insolubility 

 of animal matter, contained in them. 



From their joint analysis, it was, for the first time, 

 proved, that the subject matter of gravel, and of a very 

 large proportion of calculi, was present, in a state of 

 real chemical solution, in all healthy urine; that it was 

 possessed of the following distinguishing chemical pro- 

 perties. 



Insipidity, inodorous, crystallizable, nearly insoluble in 

 cold water, and only soluble in some thousandth parts 

 of its weight of boiling water : separable again from 



this. 



