JQg ON LARD, ABD COMPOUNDS MADE WITH IT, 



botiic acH ^as- pure, as Mr. Alyoii says, but mixed with nitrous gas and 

 ses eYolved. carbonic acid gas, as Van Mens foiuKj. 



Lardoxigen- The hird thus oxigenized is as hard us suet, and requires 

 ized by nitric ^ heat of 113° or 1 17x° to raelt it. Water boded with it, 

 and partly evaporated, acquired a lejnon colour, and a rough, 

 bitter taste ; reddened litmus ; and constantly precipitated 

 acetate of lead and nitrate of mercury. Distill^ in a retort 

 almost to dryness it yields a colourless fluitf containing a 

 qnantity of acetic acid, and not precipitating the metallic 

 solutions above mentioned. 

 YicMsan acid The water in which it is washed, bejng evaporated to the 

 owaer. f^onsistence of a thick liquid, lets full on cooling a brown, 



tenacious matter, attracting moisture from the air. The 

 supernatant liquor bei no- decanted and evaporated, an infi- 

 iiite number of small, white, very bnliiant needles form in 

 it. These Mr. Vogel took at first for oxalic acid, but lime- 

 water was not rendered turbid by it, and it had none of the 

 properties of oxalic acid. Its nature will be st-eu below. 

 K<rthcrtheco- Neither tlie yellow colour nor acidity of oxigenized lard 

 JTmclv^e'dby'^'^ can be removed by repeated ablutrons ; for after the twelfth 

 vasbing, boiling it continues yellow, and tlie wat^r poured off from it 



reddens litmus. 

 Alcohol dis- Alcohol comports itself differently. If it be boiled with 



solves a large QxiLjenized lard, it dissolves a very lav-^e quantity ; and on 

 cooling a great dtnil separates in flocks, which, collected 

 and dried, afford an oxigenized lard strikingly whitened. 

 The remaining lard is rendered whiter: the alcohol acquires 

 a yellow colour, and becomes acid ; and it retains matter 

 enough in solution to fo^rn a copious prt^cipitate with water. 



whic^i is after- q['}^P alcohol being evaporated, a great deal of yellow acid 

 -ward partly so- _ . , ,/- , i ii • i. 



liible in witer. ^^^ remamcd, winch was partly soluble in water. 



Does not re- Boiling alcohol however, employed repeatedly to wash 



moves its acid- oxigenized lard, does not deprive it completely of acidity: it 



* ^* rather dissolves the greater part of it, and the last liquor is 



still acid. 



The acidsepa- ^^ ^^^^ '^^'^^ adheres so intimately to the lard, T attempted 



rated by lime : to se])arate it by salifiable bases. For this purpose I boiled 



it with lime water, which was thus deprived of its alkalinity, 



and ac(|uired a lemon colour. This neutral liquor, which I 



* considered as a compound of lime with an acid and lard, 



wa>> 



