250 MALIC, CITRIC, AND EACEMIC ACID. 



was repeated several times, till it was sufficiently 

 purified. The malate of lime would now be found in 

 the precipitate with alcohol, but tannate of lime, 

 gypsum, &c., might likewise exist. It was dissolved 

 in water, sugar of lead added, and then filtered (a). 



The precipitate, with acetate of lead, was then sus- 

 pended in water, sulphuretted hydrogen conducted 

 through it, the sulphide of lead filtered, the liquid 

 warmed in order to expel sulphuretted hydrogen, and 

 then cooled again : it was then fully saturated with 

 milk of lime, the liquid filtered and neutralized with 

 acetic acid. JSTo tannic acid could be now found in 

 it, but if malic acid exist in the wine, malate of lime 

 was present. 



All the tests which have been hitherto applied to 

 malate of lime confirm its presence, and we therefore 

 assume that a small quantity of malic acid is con- 

 tained in red Bordeaux. 



The liquid (a) which was separated from the precipi- 

 tate of lead was first freed from lead by sulphuretted 

 hydrogen ; it contains a considerable amount of gum, 

 which may be precipitated by alcohol. No copper 

 could be reduced by the substance still remaining in 

 the liquid, when a test solution of oxide of copper and 

 potass was used, unless it had been previously warmed 

 with hydrochloric acid, then a considerable precipi- 

 tate was obtained. With the exception of acetate of 

 lime, no other distinguishable substances remain in 

 the liquid. 



