©S?ERVATI01?8, 
H 
§ 6 . 
Of the firfl: quantity of earth, the 
weight of which was 192 grains (§ 4.) 
99 grains were diflolved in acid of vi¬ 
negar. Being precipitated by fixed ve¬ 
getable alkali, and examined with the 
vitriolic acid, it was found to be magr 
nefia. 
§ 7 * 
One ounce or 480 grains of foap-rock 
contained therefore, according to the pre¬ 
ceding experiments, 
grains. 
Calcined earth of filex (§ 2.) 204gr.^ 
■-(§ 4-) 26 -1 2 3 ° 
— — ar gHl (§ S') —- 67 
—> —• magnefia (§ 6.) ——— 99 
w? calx of iron (| 3.) about 4 
400 
