EXAMINATION OF A CALCAREOUS STONE. 



303 



E. To the again filtered liquor was afterwards added 

 caustic ammonia, when no precipitation ensued ; but on 

 treating again with carbonate of potash, it occasioned u 

 cloudiness, which fell down, and when collected and ig- 

 nited weighed 1*50 grains, which dissolved with effervescence 

 in nitric acid. 



Exp. 3. A. To be still further assured of the above ex- Carbonic acid 

 periments being managed in nearly an accurate manner, I P^ collected, 

 put 100 grains of thunder-pick into a small gas bottle, and 

 poured on a sufficient quantity of nitric acid to dissolve the 

 whole. I collected the extricated gas with the mercurial 

 pneumatic apparatus in nicely graduated jars, amounting 

 to 91 cubic inches at the temperature 48° and pressure 

 29*88, which by the usual following calculation gave 92*63 

 cubic inches at the medium temperature of the air at 60", 

 and barometric pressure 30 inches. 



Rate of expansion for every degree of the thermometer , ac- 

 cording to Gay Lussac, 



480)91'00(0-189 

 480 12 



60 mean temp. 

 48 actual temp. 



12 difference. 



4300 2-268 

 3840 



4600 

 4320 



280 



91 

 2 •26 



30 — *-. 29*80 — ^-« 93*26 

 29*80 



746O8O 

 83934 

 18652 



3]0)2779-1480 



92'63 cubic inches at tHe co'TP«;ted< 

 f ■ temperature afld pressure. 



If 



