PHYSICAL ann LITERARY... 307 
mercury can be diffolved: in: lime-water or 
’ common water: ‘upon pouring in oil of vitri- 
la very ponderous acid liquor; the mercu- 
ry fubfides. Coral diffolved in fpirit of vine- 
gar, will be thrown down by the fame ‘oil | 
of’ ‘vitriol.’ Thefe inftances = on lead 
us to another ‘remark. 
JI. Some bodies’ diffélved in one acid li- 
quor may be precipitated by another acid. 
To'the two former examples of this man- 
ner of precipitation, I thall add fome others. 
Silver, diffolved in agda fortis, will be thrown 
- down, if /pir. fal. marini is put into the fo- 
lution: on the other hand, a folution of gold 
in ‘agila regia, {affers a precipitation by the 
affufion-of /pir. nitri.” That corrofive acid 
liquor, ‘called butyrum antimonit, is known 
to be a folution of the metallic part of anti- 
mony in aqua regia: if we pour into it /pir. 
nitri, after a pretty ftrong effervefcence, we 
 fhall find a metallic powder at the bottom. 
IV. Some metals diffolved in an acid li- 
quor, may be precipitated thence by ano- 
_ ther metal or metallic, ftony or calcarious 
fubftance, capable of being diffolved in the 
‘ fame met rum, 
UNDER 
