58 ESSAY V. 



quantity, however, was not dissolved, but the acid was at 

 last saturated by the addition of more manganese. On 

 adding tartarised fixed alkali to a solution of manganese, a 

 double decomposition happens, as Sees. VIL, vin., IX. 



SECTION X. EFFECTS OF DISTILLED VINEGAE. 



In a boiling heat little of the manganese was dissolved 

 by vinegar ; but, after distilling the spirit of verdigris 

 several times from manganese, the acid was saturated. On 

 adding vitriolic acid, I obtained a little white precipitate 

 (Sec. IV. (6)). Of the remaining manganese hardly any 

 sensible quantity was dissolved by concentrated vinegar, 

 though repeatedly distilled over it. The product of the 

 solution upon evaporation to dryness was deliquescent in 

 the open air. 



SECTION XI. EFFECTS OF ACID OF LEMON. 



2 drms. of levigated manganese were digested with 1 oz. 

 of the acid of lemon. The mixture, when cold, acquired a 

 brown colour ; but on the application of heat the liquid 

 began to effervesce, which continued till the acid was 

 saturated, when it had lost its brown colour. In the same 

 manner the remaining manganese was dissolved. More acid 

 was poured upon it, and thus the whole was in a few hours 

 dissolved, a white earth excepted. 



SECTION XII. EFFECTS OF AERIAL ACID. 



I saturated cold water, which contained a little snow 

 unmelted, with aerial acid, and then put a little levigated 

 manganese into it. The phial which contained this mixture 



