[ ^33 ] 



Then ioo grains Leucite fhould contain, per Bergman, a 1,35, 

 and by my calculation, 22,4. 



Bt Bergman's calculation there is a de^ficit of 0,27 of a grain, 

 and by mine an excefs of 0,77 of a grain. See 2 Klaproth, 50. 



But with refpe£t to nitre, my calculation has the advantage 

 both over his and Wenzel's, for fince 300 grains Leucite afford 123 

 of nitre, 100 grains of this ftone fhould afford 41. Then by Berg- 

 man's account, 41 grains fhould contain 20,09 of alkali, which 

 leaves a deficit of 2,16 grains; by my determination 41 grains of 

 nitre contain 21,238, which leaves a deficit of only t,oi2 grains: 



fSilex 53»5ol Silex 53,50 

 For the calculation flands thus : J Argil 24,25 lArgill 24,25 



LTartarin 20,09 J Tartarin 21,238 



97,84 98,988 



SeSlion 2d. 



Nitrated Soda. 



In my former experiment 36,05 grains of mere foda were fa- 

 turated by 145 of nitrous acid, whofe fp. grav. at 60" was 

 1,2574; this denfity is intermediate between the tabular fp. 



Vol. VII. Gg gravities 



