43 8 OBSERVATIONS ON 



that no difunion is produced, but the alkali at- 

 tracted into the competition. The red matter 

 which is obtained by infpiflation, is evidently dif- 

 ferent from the concentrated acid which exilb 

 in calculi ; its faturated colour, the force with 

 which it attracts moifture from the atmofphere, 

 tin* rofe colour which it communicates to water, 

 its folubility in the muriatic and other acids, 

 which fooner or later deprive it of all heat, 

 thcfe particulars murk fulliciently the peculiari- 

 ty of the red matter. That remarkable change is 

 produced, as I have obferved, not fo much by 

 the reiidue of the nitrous acid, as by its cflicacy 

 in dilllpating phlogiflon. A folution of this mat- 

 ter produces rofy fpots on the (kin, as alfo on 

 bones, glafs, paper, c. but on theie latter, the 

 reclrefs docs nut appear fo foon unlefs heat be 

 applied. 



1 forbear an account of my other experiments 

 on calculi; as their refults were the fame with 

 thofe which Scheele has laid before the world. 

 I /hall only add, that the chemical analyfis of the 

 ftone in the bladder may be of great benefit to 

 nudicine. lor -we can fcarce hope to find any 

 remedy \\hich may ailbrd a certain relief to the 

 evils of this dreadful cafe ; unlefs we firil difco- 

 ver the nature of the Hone. Experience has 

 flicun that lime-water and lixiviated cauilic al- 

 kali are a medicine for this complaint; uliich 



might 



