from Mount Vesuvius^ 259 



j. Carbonate of soda, and oxalate of potash, and solutions 

 of magnesia, clay, copper, iron, and zinc, either had no effects, 

 or extremely slight ones. 



k. Solution of sulphate of silver produced a white curd-like 

 precipitate. 9,35 grains of this salt (the weight of the inso- 

 luble matter being deducted) afforded 1,05 grains of slightly 

 melted muriate, or chloride, of silver. This precipitate was 

 equally produced after the salt had been made strongly red 

 hot, so that it was not owing to a portion of sal ammoniac. 



/. Tartaric acid, and muriate of platinum, occasioned the 

 precipitates in its solution which indicate potash. 



m. Nitrate of lime did not form any immediate precipitate 

 in a dilute solution of it; but in a short time, numerous minute 

 prismatic crystals of hydrate of sulphate of lime were gene- 

 rated. 



n. Nitrate of barytes poured into a solution containing 9,8 

 grains of this salt afforded a precipitate, which after being 

 ignited weighed 12,3 grains. The filtered solution crystallized 

 entirely into nitrate of potash mixed with a few rhomboides 

 of nitrate of soda. 



o. Some of this salt finely pulverized was treated with alco- 

 hol. This alcohol on exhaling left a number of minute cubic 

 crystals, which proved, by the test of nitric acid, to be muriate 

 of soda. Prussiate of soda-and-iron caused a red precipitate 

 of prussiate of copper in this alcoholic solution. 



p. The solution of this salt afforded, by crystallization, sul- 

 phate of potash in its usual forms, and some prismatic crystals 

 of hydrate of sulphate of soda. 



q. To discover what had occasioned the precipitate with 

 galls, (/) since copper has not this quality, a portion of this 



MDcccxiii. M m 



