46 ON THE PYROTARTAROUS ACID. 



it immediately precipitates acetate of lead, though the 

 sublimed concrete acid does not, when employed singly and 

 pure. 



f. The neutral compound of this acid with potash, in a 

 state of deliquescence, is soluble in alcohol. It does not 

 precipitate the salts of barytes or of lime, as the alkaline 

 tartrites do. 



g. The liquid obtained in the same process as the crystals 

 just mentioned, being evaporated with a very gentle heat, 

 likewise furnishes crystals, which have properties precisely 

 similar to the former. 



The pyrotarta- From these experiments it follows, that the pyrotartarous 



reus a distinct ac ' l( j ls a peculiar acid: that it differs from the acetous in 

 acid. 



being less volatile, in having less smell, in crystallizing by 

 evaporation, and in its combination with potash precipitating 

 acetate of lead : that it differs from tartarous acid in not 

 precipitating lime, barytes, or acetate of lead : and that it 

 does not form with potash an acidule of difficult solubility. 

 Distinguished Messrs. Fourcroy and Vauquelin made one experiment, 

 ti ° which incontestably shows, that the pyrotartarous acid is 



not acetic acid changed in its properties by combining with 

 the oil produced at the same time. They repeatedly distil- 

 led concentrated acetic acid with the oil procured by the 

 dry distillation of tartar. They theu combined this acid 

 with potash, distilled the salt thus produced with sulphuric 

 acid, and obtained nothing but empyreumatic vinegar. 

 Some acetous It appears however, that a small quantity of acetous acid 

 aci orme . ^ g f orraec | m tne distillation of tartar, from the pungent 

 smell emitted when sulphuric acid is poured on the salt 

 formed by combining the empyreumatic acid with potash. 

 Pyromucous& The pyromucous and pyroligneous acids, being subjected 

 pvrohgneous to fresh experiments, comported themselves like acetic acid 

 compounds of . ,,. , . * • ■» 



the acetic holding in solution empyreumatic oil. 



So is ihe for- The authors have examined anew the acid of ants, which 



mic * Mr. Gehlen says is different from vinegar; and they have 



confirmed the identity of these two compounds, at the same 



time showing, that the former contains a little phosphoric 



acid combined with an animal matter. 



Analysis of They conclude their paper with an analysis of tartar, or 



•ream of tartar. tne supertartrite of potash. They found, that 1000 parts of 



thiv 



